Tamper resistant dosage forms

ABSTRACT

The present invention relates to pharmaceutical dosage forms, for example to a tamper resistant dosage form including an opioid analgesic, and processes of manufacture, uses, and methods of treatment thereof.

This application claims priority from U.S. Provisional Application Ser. No. 60/840,244, filed Aug. 25, 2006, the disclosure of which is hereby incorporated by reference.

TECHNICAL FIELD OF THE INVENTION

The present invention relates to pharmaceutical dosage forms, for example to a tamper resistant dosage form including an opioid analgesic, and processes of manufacture, uses, and methods of treatment thereof.

BACKGROUND OF THE INVENTION

Pharmaceutical products are sometimes the subject of abuse. For example, a particular dose of opioid agonist may be more potent when administered parenterally as compared to the same dose administered orally. Some formulations can be tampered with to provide the opioid agonist contained therein for illicit use. Controlled release opioid agonist formulations are sometimes crushed, or subject to extraction with solvents (e.g., ethanol) by drug abusers to provide the opioid contained therein for immediate release upon oral or parenteral administration.

Controlled release opioid agonist dosage forms which can liberate a portion of the opioid upon exposure to ethanol, can also result in a patient receiving the dose more rapidly than intended if a patient disregards instructions for use and concomitantly uses alcohol with the dosage form.

There continues to exist a need in the art for pharmaceutical oral dosage forms comprising an opioid agonist without significantly changed opioid release properties when in contact with alcohol and/or with resistance to crushing.

OBJECTS AND SUMMARY OF THE INVENTION

It is an object of certain embodiments of the present invention to provide an oral extended release dosage form comprising an active agent such as an opioid analgesic which is tamper resistant.

It is an object of certain embodiments of the present invention to provide an oral extended release dosage form comprising an active agent such as an opioid analgesic which is resistant to crushing.

It is an object of certain embodiments of the present invention to provide an oral extended release dosage form comprising an active agent such as an opioid analgesic which is resistant to alcohol extraction and dose dumping when concomitantly used with or in contact with alcohol.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation in the form of a tablet or multi particulates, wherein the tablet or the individual multi particulates can be at least flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 0.5 hours of dissolution that deviates no more than about 20% points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation in the form of a tablet or multi particulates, wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours of dissolution that deviates no more than about 20% points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and non flattened reference tablet or flattened and non flattened reference multi particulates, respectively.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent; and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

According to certain such embodiments the active agent is oxycodone hydrochloride and the composition comprises more than about 5% (by wt) of the oxycodone hydrochloride.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising a composition comprising at least:

-   -   (1) at least one active agent;     -   (2) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (3) at least one polyethylene oxide having, based on rheological         measurements, a molecular weight of less than 1,000,000.

In certain embodiments, the present invention is directed to a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, an approximate molecular weight of             at least 1,000,000, and         -   (2) at least one active agent, to form a composition;     -   (b) shaping the composition to form an extended release matrix         formulation; and     -   (c) curing said extended release matrix formulation comprising         at least a curing step of subjecting the extended release matrix         formulation to a temperature which is at least the softening         temperature of said polyethylene oxide for a time period of at         least about 1 minute.

In certain embodiments, the present invention is directed to a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

(a) combining at least

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000, and     -   (2) at least one active agent,     -   to form a composition;

(b) shaping the composition to form an extended release matrix formulation; and

(c) curing said extended release matrix formulation comprising at least a curing step wherein said polyethylene oxide at least partially melts.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active agent released at 0.5 hours of dissolution that deviates no more than about 20% points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates and the non-flattened reference tablet or reference multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active agent released at 0.5 hours of dissolution that deviates no more than about 20% points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and non flattened reference tablet or flattened and non flattened reference multi particulates, respectively.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% or 0% ethanol at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent selected from opioid analgesics;         and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 10 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 85% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 15 mg or 20 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 40 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 65% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 60 mg or 80 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 60% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 8 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 94% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 12 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 92% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 32 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 90% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising a composition comprising at least:

-   -   (1) at least one active agent selected from opioid analgesics;     -   (2) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (3) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of less than         1,000,000.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, a molecular weight of at least 800,000; and     -   (2) at least one active agent selected from opioid analgesics;         and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent; and

wherein the extended release matrix formulation when subjected to an indentation test has a cracking force of at least about 110 N.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent; and

wherein the extended release matrix formulation when subjected to an indentation test has a “penetration depth to crack distance” of at least about 1.0 mm.

In certain embodiments, the present invention is directed to a method of treatment wherein a dosage form according to the invention comprising an opioid analgesic is administered for treatment of pain to a patient in need thereof.

In certain embodiments, the present invention is directed to the use of a dosage form according to the invention comprising an opioid analgesic for the manufacture of a medicament for the treatment of pain.

In certain embodiments, the present invention is directed to the use of high molecular weight polyethylene oxide that has, based on rheological measurements, an approximate molecular weight of at least 1,000,000, as matrix forming material in the manufacture of a solid extended release oral dosage form comprising an active selected from opioids for imparting to the solid extended release oral dosage form resistance to alcohol extraction.

In certain embodiments, the present invention is directed to a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, a molecular weight of at least             1,000,000, and         -   (2) at least one active agent,         -   to form a composition;     -   (b) shaping the composition to form an extended release matrix         formulation; and     -   (c) curing said extended release matrix formulation comprising         at least a curing step of subjecting the extended release matrix         formulation to a temperature which is at least the softening         temperature of said polyethylene oxide for a time period of at         least 5 minutes.

According to certain embodiments of the invention the solid extended release pharmaceutical dosage form is for use as a suppository.

The term “extended release” is defined for purposes of the present invention as to refer to products which are formulated to make the drug available over an extended period after ingestion thereby allowing a reduction in dosing frequency compared to a drug presented as a conventional dosage form (e.g. as a solution or an immediate release dosage form).

The term “immediate release” is defined for the purposes of the present invention as to refer to products which are formulated to allow the drug to dissolve in the gastrointestinal contents with no intention of delaying or prolonging the dissolution or absorption of the drug.

The term “solid oral extended release pharmaceutical dosage form” refers to the administration form comprising a unit dose of active agent in extended release form such as an “extended release matrix formulation” and optionally other adjuvants and additives conventional in the art, such as a protective coating or a capsule and the like, and optionally any other additional features or components that are used in the dosage form. Unless specifically indicated the term “solid oral extended release pharmaceutical dosage form” refers to said dosage form in intact form i.e. prior to any tampering. The extended release pharmaceutical dosage form can e.g. be a tablet comprising the extended release matrix formulation or a capsule comprising the extended release matrix formulation in the form of multi particulates. The “extended release pharmaceutical dosage form” may comprise a portion of active agent in extended release form and another portion of active agent in immediate release form, e.g. as an immediate release layer of active agent surrounding the dosage form or an immediate release component included within the dosage form.

The term “extended release matrix formulation” is defined for purposes of the present invention as shaped solid form of a composition comprising at least one active agent and at least one extended release feature such as an extended release matrix material such as e.g. high molecular weight polyethylene oxide. The composition can optionally comprise more than these two compounds namely further active agents and additional retardants and/or other materials, including but not limited to low molecular weight polyethylene oxides and other adjuvants and additives conventional in the art.

The term “bioequivalent/bioequivalence” is defined for the purposes of the present invention to refer to a dosage form that provides geometric mean values of C_(max), AUC_(t), and AUC_(inf) for an active agent, wherein the 90% confidence intervals estimated for the ratio (test/reference) fall within the range of 80.00% to 125.00%. Preferably, the mean values C_(max), AUC_(t), and AUC_(inf) fall within the range of 80.00% to 125.00% as determined in both the fed and the fasting states.

The term “polyethylene oxide” is defined for purposes of the present invention as having a molecular weight of at least 25,000, measured as is conventional in the art, and preferably having a molecular weight of at least 100,000. Compositions with lower molecular weight are usually referred to as polyethylene glycols.

The term “high molecular weight polyethylene oxide” is defined for proposes of the present invention as having an approximate molecular weight of at least 1,000,000. For the purpose of this invention the approximate molecular weight is based on rheological measurements. Polyethylene oxide is considered to have an approximate molecular weight of 1,000,000 when a 2% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 1, at 10 rpm, at 25° C. shows a viscosity range of 400 to 800 mPa s (cP). Polyethylene oxide is considered to have an approximate molecular weight of 2,000,000 when a 2% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 3, at 10 rpm, at 25° C. shows a viscosity range of 2000 to 4000 mPa s (cP). Polyethylene oxide is considered to have an approximate molecular weight of 4,000,000 when a 1% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 2, at 2 rpm, at 25° C. shows a viscosity range of 1650 to 5500 mPa s (cP). Polyethylene oxide is considered to have an approximate molecular weight of 5,000,000 when a 1% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 2, at 2 rpm, at 25° C. shows a viscosity range of 5500 to 7500 mPa s (cP). Polyethylene oxide is considered to have an approximate molecular weight of 7,000,000 when a 1% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 2, at 2 rpm, at 25° C. shows a viscosity range of 7500 to 10,000 mPa s (cP). Polyethylene oxide is considered to have an approximate molecular weight of 8,000,000 when a 1% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 2, at 2 rpm, at 25° C. shows a viscosity range of 10,000 to 15,000 mPa s (cP). Regarding the lower molecular weight polyethylene oxides; Polyethylene oxide is considered to have an approximate molecular weight of 100,000 when a 5% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVT, spindle No. 1, at 50 rpm, at 25° C. shows a viscosity range of 30 to 50 mPa s (cP) and polyethylene oxide is considered to have an approximate molecular weight of 900,000 when a 5% (by wt) aqueous solution of said polyethylene oxide using a Brookfield viscometer Model RVF, spindle No. 2, at 2 rpm, at 25° C. shows a viscosity range of 8800 to 17,600 mPa s (cP).

The term “low molecular weight polyethylene oxide” is defined for purposes of the present invention as having, based on the rheological measurements outlined above, an approximate molecular weight of less than 1,000,000.

The term “direct compression” is defined for purposes of the present invention as referring to a tableting process wherein the tablet or any other compressed dosage form is made by a process comprising the steps of dry blending the compounds and compressing the dry blend to form the dosage form, e.g. by using a diffusion blend and/or convection mixing process (e.g. Guidance for Industry, SUPAC-IR/MR: Immediate Release and Modified Release Solid Oral Dosage Forms, Manufacturing Equipment Addendum).

The term “bed of free flowing tablets” is defined for the purposes of the present invention as referring to a batch of tablets that are kept in motion with respect to each other as e.g. in a coating pan set at a suitable rotation speed or in a fluidized bed of tablets. The bed of free flowing tablets preferably reduces or prevents the sticking of tablets to one another.

The term “flattening” and related terms as used in the context of flattening tablets or other dosage forms in accordance with the present invention means that a tablet is subjected to force applied from a direction substantially perpendicular to the diameter and substantially inline with the thickness of e.g. a tablet. The force may be applied with a carver style bench press (unless expressly mentioned otherwise) to the extent necessary to achieve the target flatness/reduced thickness. According to certain embodiments of the invention the flattening does not result in breaking the tablet in pieces, however, edge spits and cracks may occur. The flatness is described in terms of the thickness of the flattened tablet compared to the thickness of the non-flattened tablet expressed in % thickness, based on the thickness of the non flattened tablet. Apart from tablets, the flattening can be applied to any shape of a dosage form, wherein the force is applied from a direction substantially in line with the smallest diameter (i.e. the thickness) of the shape when the shape is other than spherical and from any direction when the shape is spherical. The flatness is then described in terms of the thickness/smallest diameter of the flattened shape compared to the thickness/smallest diameter of the non-flattened shape expressed in % thickness, based on the thickness/smallest diameter of the non flattened shape, when the initial shape is non spherical, or the % thickness, based on the non flattened diameter when the initial shape is spherical. The thickness is measured using a thickness gauge (e.g., digital thickness gauge or digital caliper) In FIGS. 4 to 6 tablets are shown that where flattened using a carver bench press. The initial shape of the tablets is shown in FIGS. 1 to 3 on the left hand side of the photograph.

In certain embodiments of the invention, apart from using a bench press a hammer can be used for flattening tablets/dosage forms. In such a flattening process hammer strikes are manually applied from a direction substantially inline with the thickness of e.g. the tablet. The flatness is then also described in terms of the thickness/smallest diameter of the flattened shape compared to the non-flattened shape expressed in % thickness, based on the thickness/smallest diameter of the non-flattened shape when the initial shape is non spherical, or the % thickness, based on the non flattened diameter when the initial shape is spherical. The thickness is measured using a thickness gauge (e.g., digital thickness gauge or digital caliper).

By contrast, when conducting the breaking strength or tablet hardness test as described in Remington's Pharmaceutical Sciences, 18^(th) edition, 1990, Chapter 89 “Oral Solid Dosage Forms”, pages 1633-1665, which is incorporated herein by reference, using the Schleuniger Apparatus the tablet/dosage form is put between a pair of flat plates arranged in parallel, and pressed by means of the flat plates, such that the force is applied substantially perpendicular to the thickness and substantially in line with the diameter of the tablet, thereby reducing the diameter in that direction. This reduced diameter is described in terms of % diameter, based on the diameter of the tablet before conducting the breaking strength test. The breaking strength or tablet hardness is defined as the force at which the tested tablet/dosage form breaks. Tablets/dosage forms that do not break, but which are deformed due to the force applied are considered to be break-resistant at that particular force.

A further test to quantify the strength of tablets/dosage forms is the indentation test using a Texture Analyzer, such as the TA-XT2 Texture Analyzer (Texture Technologies Corp., 18 Fairview Road, Scarsdale, N.Y. 10583). In this method, the tablets/dosage forms are placed on top of a stainless stand with slightly concaved surface and subsequently penetrated by the descending probe of the Texture Analyzer, such as a TA-8A ⅛ inch diameter stainless steel ball probe. Before starting the measurement, the tablets are aligned directly under the probe, such that the descending probe will penetrate the tablet pivotally, i.e. in the center of the tablet, and such that the force of the descending probe is applied substantially perpendicular to the diameter and substantially in line with the thickness of the tablet. First, the probe of the Texture Analyzer starts to move towards the tablet sample at the pre-test speed. When the probe contacts the tablet surface and the trigger force set is reached, the probe continues its movement with the test speed and penetrates the tablet. For each penetration depth of the probe, which will hereinafter be referred to as “distance”, the corresponding force is measured, and the data are collected. When the probe has reached the desired maximum penetration depth, it changes direction and moves back at the post-test speed, while further data can be collected. The cracking force is defined to be the force of the first local maximum that is reached in the corresponding force/distance diagram and is calculated using for example the Texture Analyzer software “Texture Expert Exceed, Version 2.64 English”. Without wanting to be bound by any theory, it is believed that at this point, some structural damage to the tablet/dosage form occurs in form of cracking. However, the cracked tablets/dosage forms according to certain embodiments of the present invention remain cohesive, as evidenced by the continued resistance to the descending probe. The corresponding distance at the first local maximum is hereinafter referred to as the “penetration depth to crack” distance.

For the purposes of certain embodiments of the present invention, the term “breaking strength” refers to the hardness of the tablets/dosage forms that is preferably measured using the Schleuniger apparatus, whereas the term “cracking force” reflects the strength of the tablets/dosage forms that is preferably measured in the indentation test using a Texture Analyzer.

A further parameter of the extended release matrix formulations that can be derived from the indentation test as described above is the work the extended release matrix formulation is subjected to in an indentation test as described above. The work value corresponds to the integral of the force over the distance.

The term “resistant to crushing” is defined for the purposes of certain embodiments of the present invention as referring to dosage forms that can at least be flattened with a bench press as described above without breaking to no more than about 60% thickness, preferably no more than about 50% thickness, more preferred no more than about 40% thickness, even more preferred no more than about 30% thickness and most preferred no more than about 20% thickness, 10% thickness or 5% thickness.

For the purpose of certain embodiments of the present invention dosage forms are regarded as “resistant to alcohol extraction” when the respective dosage form provides an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours, preferably at 0.5 and 0.75 hours, more preferred at 0.5, 0.75 and 1 hour, even more preferred at 0.5, 0.75, 1 and 1.5 hours and most preferred at 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points or preferably no more than about 15% points at each of said time points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol.

The term “tamper resistant” for the purposes of the present invention refers to dosage forms which at least provide resistance to crushing or resistance to alcohol extraction, preferably both, as defined above and may have further tamper resistant characteristics.

For the purpose of the present invention the term “active agent” is defined as a pharmaceutically active substance which includes without limitation opioid analgesics.

For purposes of the present invention, the term “opioid analgesic” includes single compounds and compositions of compounds selected from the group of opioids and which provide an analgesic effect such as one single opioid agonist or a combination of opioid agonists, one single mixed opioid agonist-antagonist or a combination of mixed opioid agonist-antagonists, or one single partial opioid agonist or a combination of partial opioid agonists and combinations of an opioid agonists, mixed opioid agonist-antagonists and partial opioid agonists with one ore more opioid antagonists, stereoisomers, ether or ester, salts, hydrates and solvates thereof, compositions of any of the foregoing, and the like.

The present invention disclosed herein is specifically meant to encompass the use of the opioid analgesic in form of any pharmaceutically acceptable salt thereof.

Pharmaceutically acceptable salts include, but are not limited to, inorganic acid salts such as hydrochloride, hydrobromide, sulfate, phosphate and the like; organic acid salts such as formate, acetate, trifluoroacetate, maleate, tartrate and the like; sulfonates such as methanesulfonate, benzenesulfonate, p-toluenesulfonate, and the like; amino acid salts such as arginate, asparginate, glutamate and the like, and metal salts such as sodium salt, potassium salt, cesium salt and the like; alkaline earth metals such as calcium salt, magnesium salt and the like; organic amine salts such as triethylamine salt, pyridine salt, picoline salt, ethanolamine salt, triethanolamine salt, dicyclohexylamine salt, N,N′-dibenzylethylenediamine salt and the like.

The opioids used according to the present invention may contain one or more asymmetric centers and may give rise to enantiomers, diastereomers, or other stereoisomeric forms. The present invention is also meant to encompass the use of all such possible forms as well as their racemic and resolved forms and compositions thereof. When the compounds described herein contain olefinic double bonds or other centers of geometric asymmetry, it is intended to include both E and Z geometric isomers. All tautomers are intended to be encompassed by the present invention as well.

As used herein, the term “stereoisomers” is a general term for all isomers of individual molecules that differ only in the orientation of their atoms is space. It includes enantiomers and isomers of compounds with more than one chiral center that are not mirror images of one another (diastereomers).

The term “chiral center” refers to a carbon atom to which four different groups are attached.

The term “enantiomer” or “enantiomeric” refers to a molecule that is nonsuperimposeable on its mirror image and hence optically active wherein the enantiomer rotates the plane of polarized light in one direction and its mirror image rotates the plane of polarized light in the opposite direction.

The term “racemic” refers to a mixture of equal parts of enantiomers and which is optically inactive.

The term “resolution” refers to the separation or concentration or depletion of one of the two enantiomeric forms of a molecule.

Opioid agonists useful in the present invention include, but are not limited to, alfentanil, allylprodine, alphaprodine, anileridine, benzylmorphine, bezitramide, buprenorphine, butorphanol, clonitazene, codeine, desomorphine, dextromoramide, dezocine, diampromide, diamorphone, dihydrocodeine, dihydromorphine, dimenoxadol, dimepheptanol, dimethylthiambutene, dioxaphetyl butyrate, dipipanone, eptazocine, ethoheptazine, ethylmethylthiambutene, ethylmorphine, etonitazene, etorphine, dihydroetorphine, fentanyl and derivatives, hydrocodone, hydromorphone, hydroxypethidine, isomethadone, ketobemidone, levorphanol, levophenacylmorphan, lofentanil, meperidine, meptazinol, metazocine, methadone, metopon, morphine, myrophine, narceine, nicomorphine, norlevorphanol, normethadone, nalorphine, nalbuphene, normorphine, norpipanone, opium, oxycodone, oxymorphone, papaveretum, pentazocine, phenadoxone, phenomorphan, phenazocine, phenoperidine, piminodine, piritramide, propheptazine, promedol, properidine, propoxyphene, sufentanil, tilidine, tramadol, pharmaceutically acceptable salts, hydrates and solvates thereof, mixtures of any of the foregoing, and the like.

Opioid antagonists useful in combination with opioid agonists as described above are e.g. naloxone, naltrexone and nalmephene or pharmaceutically acceptable salts, hydrates and solvates thereof, mixtures of any of the foregoing, and the like.

In certain embodiments e.g. a combination of oxycodone HCl and naloxone HCl in a ratio of 2:1 is used.

In certain embodiments, the opioid analgesic is selected from codeine, morphine, oxycodone, hydrocodone, hydromorphone, or oxymorphone or pharmaceutically acceptable salts, hydrates and solvates thereof, mixtures of any of the foregoing, and the like.

In certain embodiments, the opioid analgesic is oxycodone, hydromorphone or oxymorphone or a salt thereof such as e.g. the hydrochloride. The dosage form comprises from about 5 mg to about 500 mg oxycodone hydrochloride, from about 1 mg to about 100 mg hydromorphone hydrochloride or from about 5 mg to about 500 mg oxymorphone hydrochloride. If other salts, derivatives or forms are used, equimolar amounts of any other pharmaceutically acceptable salt or derivative or form including but not limited to hydrates and solvates or the free base may be used. The dosage form comprises e.g. 5 mg, 7.5 mg, 10 mg, 15 mg, 20 mg, 30 mg, 40 mg, 45 mg, 60 mg, or 80 mg, 90 mg, 120 mg or 160 mg oxycodone hydrochloride or equimolar amounts of any other pharmaceutically acceptable salt, derivative or form including but not limited to hydrates and solvates or of the free base. The dosage form comprises e.g. 5 mg, 7.5 mg, 10 mg, 15 mg, 20 mg, 30, mg, 40 mg, 45 mg, 60 mg, or 80 mg, 90 mg, 120 mg or 160 mg oxymorphone hydrochloride or equimolar amounts of any other pharmaceutically acceptable salt, derivative or form including but not limited to hydrates and solvates or of the free base. The dosage form comprises e.g. 2 mg, 4 mg, 8 mg, 12 mg, 16 mg, 24 mg, 32 mg, 48 mg or 64 mg hydromorphone hydrochloride or equimolar amounts of any other pharmaceutically acceptable salt, derivative or form including but not limited to hydrates and solvates or of the free base.

WO 2005/097801 A1, U.S. Pat. No. 7,129,248 B2 and US 2006/0173029 A1, all of which are hereby incorporated by reference, describe a process for preparing oxycodone hydrochloride having a 14-hydroxycodeinone level of less than about 25 ppm, preferably of less than about 15 ppm, less than about 10 ppm, or less than about 5 ppm, more preferably of less than about 2 ppm, less than about 1 ppm, less than about 0.5 ppm or less than about 0.25 ppm.

The term “ppm” as used herein means “parts per million”. Regarding 14-hydroxycodeinone, “ppm” means parts per million of 14-hydroxycodeinone in a particular sample product. The 14-hydroxycodeinone level can be determined by any method known in the art, preferably by HPLC analysis using UV detection.

In certain embodiments of the present invention, wherein the active agent is oxycodone hydrochloride, oxycodone hydrochloride is used having a 14-hydroxycodeinone level of less than about 25 ppm, preferably of less than about 15 ppm, less than about 10 ppm, or less than about 5 ppm, more preferably of less than about 2 ppm, less than about 1 ppm, less than about 0.5 ppm or less than about 0.25 ppm.

In certain other embodiments other therapeutically active agents may be used in accordance with the present invention, either in combination with opioids or instead of opioids. Examples of such therapeutically active agents include antihistamines (e.g., dimenhydrinate, diphenhydramine, chlorpheniramine and dexchlorpheniramine maleate), non-steroidal anti-inflammatory agents (e.g., naproxen, diclofenac, indomethacin, ibuprofen, sulindac, Cox-2 inhibitors) and acetaminophen, anti-emetics (e.g., metoclopramide, methylnaltrexone), anti-epileptics (e.g., phenytoin, meprobmate and nitrazepam), vasodilators (e.g., nifedipine, papaverine, diltiazem and nicardipine), anti-tussive agents and expectorants (e.g. codeine phosphate), anti-asthmatics (e.g. theophylline), antacids, anti-spasmodics (e.g. atropine, scopolamine), antidiabetics (e.g., insulin), diuretics (e.g., ethacrynic acid, bendrofluthiazide), anti-hypotensives (e.g., propranolol, clonidine), antihypertensives (e.g., clonidine, methyldopa), bronchodilatiors (e.g., albuterol), steroids (e.g., hydrocortisone, triamcinolone, prednisone), antibiotics (e.g., tetracycline), antihemorrhoidals, hypnotics, psychotropics, antidiarrheals, mucolytics, sedatives, decongestants (e.g. pseudoephedrine), laxatives, vitamins, stimulants (including appetite suppressants such as phenylpropanolamine) and cannabinoids, as well as pharmaceutically acceptable salts, hydrates, and solvates of the same.

In certain embodiments, the invention is directed to the use of Cox-2 inhibitors as active agents, in combination with opioid analgesics or instead of opioid analgesics, for example the use of Cox-2 inhibitors such as meloxicam (4-hydroxy-2-methyl-N-(5-methyl-2-thiazolyl)-2H-1,2-benzothiazine-3-carboxamide-1,1-dioxide), as disclosed in U.S. Ser. Nos. 10/056,347 and 11/825,938, which are hereby incorporated by reference, nabumetone (4-(6-methoxy-2-naphthyl)-2-butanone), as disclosed in U.S. Ser. No. 10/056,348, which is hereby incorporated by reference, celecoxib (4-[5-(4-methylphenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl]benzenesulfonamide), as disclosed in U.S. Ser. No. 11/698,394, which is hereby incorporated by reference, nimesulide (N-(4-Nitro-2-phenoxyphenyl)methanesulfonamide), as disclosed in U.S. Ser. No. 10/057,630, which is hereby incorporated by reference, and N-[3-(formylamino)-4-oxo-6-phenoxy-4H-1-benzopyran-7-yl] methanesulfonamide (T-614), as disclosed in U.S. Ser. No. 10/057,632, which is hereby incorporated by reference.

The present invention is also directed to the dosage forms utilizing active agents such as for example, benzodiazepines, barbiturates or amphetamines. These may be combined with the respective antagonists.

The term “benzodiazepines” refers to benzodiazepines and drugs that are derivatives of benzodiazepine that are able to depress the central nervous system. Benzodiazepines include, but are not limited to, alprazolam, bromazepam, chlordiazepoxide, clorazepate, diazepam, estazolam, flurazepam, halazepam, ketazolam, lorazepam, nitrazepam, oxazepam, prazepam, quazepam, temazepam, triazolam, methylphenidate as well as pharmaceutically acceptable salts, hydrates, and solvates and mixtures thereof. Benzodiazepine antagonists that can be used in the present invention include, but are not limited to, flumazenil as well as pharmaceutically acceptable salts, hydrates, and solvates.

Barbiturates refer to sedative-hypnotic drugs derived from barbituric acid (2, 4, 6,-trioxohexahydropyrimidine). Barbiturates include, but are not limited to, amobarbital, aprobarbotal, butabarbital, butalbital, methohexital, mephobarbital, metharbital, pentobarbital, phenobarbital, secobarbital and as well as pharmaceutically acceptable salts, hydrates, and solvates mixtures thereof. Barbiturate antagonists that can be used in the present invention include, but are not limited to, amphetamines as well as pharmaceutically acceptable salts, hydrates, and solvates.

Stimulants refer to drugs that stimulate the central nervous system.

Stimulants include, but are not limited to, amphetamines, such as amphetamine, dextroamphetamine resin complex, dextroamphetamine, methamphetamine, methylphenidate as well as pharmaceutically acceptable salts, hydrates, and solvates and mixtures thereof. Stimulant antagonists that can be used in the present invention include, but are not limited to, benzodiazepines, as well as pharmaceutically acceptable salts, hydrates, and solvates as described herein.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of tablets of Example 7.1 before (left side) and after (right side) the breaking strength test using the Schleuniger Model 6D apparatus.

FIG. 2 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of tablets of Example 7.2 before (left side) and after (right side) the breaking strength test using the Schleuniger Model 6D apparatus.

FIG. 3 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of tablets of Example 7.3 before (left side) and after (right side) the breaking strength test using the Schleuniger Model 6D apparatus.

FIG. 4 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.1 after flattening with a Carver manual bench press (hydraulic unit model #3912).

FIG. 5 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.2 after flattening with a Carver manual bench press (hydraulic unit model #3912).

FIG. 6 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.3 after flattening with a Carver manual bench press (hydraulic unit model #3912).

FIG. 7 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.1 after 10 manually conducted hammer strikes.

FIG. 8 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.2 after 10 manually conducted hammer strikes.

FIG. 9 is a photograph that depicts a top view (view is in line with the thickness of the tablet) of a tablet of Example 7.3 after 10 manually conducted hammer strikes.

FIG. 10 is a diagram that depicts the temperature profile of the curing process of Example 13.1.

FIG. 11 is a diagram that depicts the temperature profile of the curing process of Example 13.2.

FIG. 12 is a diagram that depicts the temperature profile of the curing process of Example 13.3.

FIG. 13 is a diagram that depicts the temperature profile of the curing process of Example 13.4.

FIG. 14 is a diagram that depicts the temperature profile of the curing process of Example 13.5.

FIG. 15 is a diagram that depicts the temperature profile of the curing process of Example 14.1.

FIG. 16 is a diagram that depicts the temperature profile of the curing process of Example 14.2.

FIG. 17 is a diagram that depicts the temperature profile of the curing process of Example 14.3.

FIG. 18 is a diagram that depicts the temperature profile of the curing process of Example 14.4.

FIG. 19 is a diagram that depicts the temperature profile of the curing process of Example 14.5.

FIG. 20 is a diagram of Example 20 indentation test performed with an Example 13.1 tablet (cured for 30 minutes, uncoated).

FIG. 21 is a diagram of Example 20 indentation test performed with an Example 13.2 tablet (cured for 30 minutes, uncoated).

FIG. 22 is a diagram of Example 20 indentation test performed with an Example 13.3 tablet (cured for 30 minutes, uncoated).

FIG. 23 is a diagram of Example 20 indentation test performed with an Example 13.4 tablet (cured for 30 minutes, uncoated).

FIG. 24 is a diagram of Example 20 indentation test performed with an Example 13.5 tablet (cured for 30 minutes, uncoated).

FIG. 25 is a diagram of Example 20 indentation test performed with an Example 17.1 tablet (cured for 15 minutes at 72° C., coated).

FIG. 26 is a diagram of Example 20 indentation test performed with an Example 18.2 tablet (cured for 15 minutes at 72° C., coated).

FIG. 27 is a diagram of Example 20 indentation test performed with an Example 14.1 tablet (cured for 1 hour, coated).

FIG. 28 is a diagram of Example 20 indentation test performed with an Example 14.2 tablet (cured for 1 hour, coated).

FIG. 29 is a diagram of Example 20 indentation test performed with an Example 14.3 tablet (cured for 1 hour, coated).

FIG. 30 is a diagram of Example 20 indentation test performed with an Example 14.4 tablet (cured for 1 hour, coated).

FIG. 31 is a diagram of Example 20 indentation test performed with an Example 14.5 tablet (cured for 1 hour, coated).

FIG. 32 is a diagram of Example 20 indentation test performed with an Example 16.1 tablet (cured for 15 minutes, coated).

FIG. 33 is a diagram of Example 20 indentation test performed with an Example 16.2 tablet (cured for 15 minutes, coated).

FIG. 34 is a diagram of Example 21 indentation tests performed with an Example 16.1 tablet (cured for 15 minutes, coated) and with a commercial Oxycontin™ 60 mg tablet.

FIG. 35 is a diagram of Example 21 indentation tests performed with an Example 16.2 tablet (cured for 15 minutes, coated) and with a commercial Oxycontin™ 80 mg tablet.

FIG. 36 shows the mean plasma oxycodone concentration versus time profile on linear scale [Population: Full Analysis (Fed State)] according to Example 26.

FIG. 37 shows the mean plasma oxycodone concentration versus time profile on log-linear scale [Population: Full Analysis (Fed State)] according to Example 26.

FIG. 38 shows the mean plasma oxycodone concentration versus time profile on linear scale [Population: Full Analysis (Fasted State)] according to Example 26.

FIG. 39 shows the mean plasma oxycodone concentration versus time profile on log-linear scale [Population: Full Analysis (Fasted State)] according to Example 26.

FIG. 40 shows representative images of crushed OxyContin™ 10 mg and crushed Example 7.2 tablets, according to Example 27.

FIG. 41 shows representative images of milled Example 7.2 and OxyContin™ 10 mg tablets before and after 45 minutes of dissolution, according to Example 27.

FIG. 42 shows dissolution profiles of milled Example 7.2 tablets and crushed OxyContin™ 10 mg tablets, according to Example 27.

FIG. 43 shows particle size distribution graphs of milled tablets (OxyContin™ 10 mg, Example 7.2 and Example 14.5 tablets), according to Example 27.

DETAILED DESCRIPTION

In certain embodiments, the present invention is directed to a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, an approximate molecular weight of             at least 1,000,000, and         -   (2) at least one active agent,         -   to form a composition;     -   (b) shaping the composition to form an extended release matrix         formulation; and     -   (c) curing said extended release matrix formulation comprising         at least a curing step of subjecting the extended release matrix         formulation to a temperature which is at least the softening         temperature of said polyethylene oxide for a time period of at         least about 1 minute.         Preferably, the curing is conducted at atmospheric pressure.

In a certain embodiment the present invention concerns a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, an molecular weight of at least             1,000,000; and         -   (2) at least one active agent,         -   to form a composition;     -   (b) shaping the composition to form an extended release matrix         formulation; and     -   (c) curing said extended release matrix formulation comprising         at least a curing step of subjecting the extended release matrix         formulation to a temperature which is at least the softening         temperature of said polyethylene oxide for a time period of at         least 5 minutes. Preferably, the curing is conducted at         atmospheric pressure.

In certain embodiments, the present invention is directed to a process of preparing a solid oral extended release pharmaceutical dosage form, comprising at least the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, an approximate molecular weight of             at least 1,000,000, and         -   (2) at least one active agent,         -   to form a composition;     -   (b) shaping the composition to form an extended release matrix         formulation; and     -   (c) curing said extended release matrix formulation comprising         at least a curing step wherein said polyethylene oxide at least         partially melts.         Preferably, the curing is conducted at atmospheric pressure.

In certain embodiments the composition is shaped in step b) to form an extended release matrix formulation in the form of tablet. For shaping the extended release matrix formulation in the form of tablet a direct compression process can be used. Direct compression is an efficient and simple process for shaping tablets by avoiding process steps like wet granulation. However, any other process for manufacturing tablets as known in the art may be used, such as wet granulation and subsequent compression of the granules to form tablets.

In one embodiment, the curing of the extended release matrix formulation in step c) comprises at least a curing step wherein the high molecular weight polyethylene oxide in the extended release matrix formulation at least partially melts. For example, at least about 20% or at least about 30% of the high molecular weight polyethylene oxide in the extended release matrix formulation melts. Preferably, at least about 40% or at least about 50%, more preferably at least about 60%, at least about 75% or at least about 90% of the high molecular weight polyethylene oxide in the extended release matrix formulation melts. In a preferred embodiment, about 100% of the high molecular weight polyethylene oxide melts.

In other embodiments, the curing of the extended release matrix formulation in step c) comprises at least a curing step wherein the extended release matrix formulation is subjected to an elevated temperature for a certain period of time. In such embodiments, the temperature employed in step c), i.e. the curing temperature, is at least as high as the softening temperature of the high molecular weight polyethylene oxide. Without wanting to be bound to any theory it is believed that the curing at a temperature that is at least as high as the softening temperature of the high molecular weight polyethylene oxide causes the polyethylene oxide particles to at least adhere to each other or even to fuse. According to some embodiments the curing temperature is at least about 60° C. or at least about 62° C. or ranges from about 62° C. to about 90° C. or from about 62° C. to about 85° C. or from about 62° C. to about 80° C. or from about 65° C. to about 90° C. or from about 65° C. to about 85° C. or from about 65° C. to about 80° C. The curing temperature preferably ranges from about 68° C. to about 90° C. or from about 68° C. to about 85° C. or from about 68° C. to about 80° C., more preferably from about 70° C. to about 90° C. or from about 70° C. to about 85° C. or from about 70° C. to about 80° C., most preferably from about 72° C. to about 90° C. or from about 72° C. to about 85° C. or from about 72° C. to about 80° C. The curing temperature may be at least about 60° C. or at least about 62° C., but less than about 90° C. or less than about 80° C. Preferably, it is in the range of from about 62° C. to about 72° C., in particular from about 68° C. to about 72° C. Preferably, the curing temperature is at least as high as the lower limit of the softening temperature range of the high molecular weight polyethylene oxide or at least about 62° C. or at least about 68° C. More preferably, the curing temperature is within the softening temperature range of the high molecular weight polyethylene oxide or at least about 70° C. Even more preferably, the curing temperature is at least as high as the upper limit of the softening temperature range of the high molecular weight polyethylene oxide or at least about 72° C. In an alternative embodiment, the curing temperature is higher than the upper limit of the softening temperature range of the high molecular weight polyethylene oxide, for example the curing temperature is at least about 75° C. or at least about 80° C.

In those embodiments where the curing of the extended release matrix formulation in step c) comprises at least a curing step wherein the extended release matrix formulation is subjected to an elevated temperature for a certain period of time, this period of time is hereinafter referred to as the curing time. For the measurement of the curing time a starting point and an end point of the curing step is defined. For the purposes of the present invention, the starting point of the curing step is defined to be the point in time when the curing temperature is reached.

In certain embodiments, the temperature profile during the curing step shows a plateau-like form between the starting point and the end point of the curing. In such embodiments the end point of the curing step is defined to be the point in time when the heating is stopped or at least reduced, e.g. by terminating or reducing the heating and/or by starting a subsequent cooling step, and the temperature subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C. When the curing temperature is reached and the curing step is thus started, deviations from the curing temperature in the course of the curing step can occur. Such deviations are tolerated as long as they do not exceed a value of about ±10° C., preferably about ±6° C., and more preferably about ±3° C. For example, if a curing temperature of at least about 75° C. is to be maintained, the measured temperature may temporarily increase to a value of about 85° C., preferably about 81° C. and more preferably about 78° C., and the measured temperature may also temporarily drop down to a value of about 65° C., preferably about 69° C. and more preferably about 72° C. In the cases of a larger decrease of the temperature and/or in the case that the temperature drops below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., the curing step is discontinued, i.e. an end point is reached. Curing can be restarted by again reaching the curing temperature.

In other embodiments, the temperature profile during the curing step shows a parabolic or triangular form between the starting point and the end point of the curing. This means that after the starting point, i.e. the point in time when the curing temperature is reached, the temperature further increases to reach a maximum, and then decreases. In such embodiments, the end point of the curing step is defined to be the point in time when the temperature drops below the curing temperature.

In this context, it has to be noted that depending on the apparatus used for the curing, which will hereinafter be called curing device, different kinds of temperatures within the curing device can be measured to characterize the curing temperature.

In certain embodiments, the curing step may take place in an oven. In such embodiments, the temperature inside the oven is measured. Based thereon, when the curing step takes place in an oven, the curing temperature is defined to be the target inside temperature of the oven and the starting point of the curing step is defined to be the point in time when the inside temperature of the oven reaches the curing temperature. The end point of the curing step is defined to be (1) the point in time when the heating is stopped or at least reduced and the temperature inside the oven subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., in a plateau-like temperature profile or (2) the point in time when the temperature inside the oven drops below the curing temperature in a parabolic or triangular temperature profile. Preferably, the curing step starts when the temperature inside the oven reaches a curing temperature of at least about 62° C., at least about 68° C. or at least about 70° C., more preferably of at least about 72° C. or at least about 75° C. In preferred embodiments, the temperature profile during the curing step shows a plateau-like form, wherein the curing temperature, i.e. the inside temperature of the oven, is preferably at least about 68° C., for example about 70° C. or about 72° C. or about 73° C., or lies within a range of from about 70° C. to about 75° C., and the curing time is preferably in the range of from about 30 minutes to about 20 hours, more preferably from about 30 minutes to about 15 hours, or from about 30 minutes to about 4 hours or from about 30 minutes to about 2 hours. Most preferably, the curing time is in the range of from about 30 minutes to about 90 minutes.

In certain other embodiments, the curing takes place in curing devices that are heated by an air flow and comprise a heated air supply (inlet) and an exhaust, like for example a coating pan or fluidized bed. Such curing devices will hereinafter be called convection curing devices. In such curing devices, it is possible to measure the temperature of the inlet air, i.e. the temperature of the heated air entering the convection curing device and/or the temperature of the exhaust air, i.e. the temperature of the air leaving the convection curing device. It is also possible to determine or at least estimate the temperature of the formulations inside the convection curing device during the curing step, e.g. by using infrared temperature measurement instruments, such as an IR gun, or by measuring the temperature using a temperature probe that was placed inside the curing device near the extended release matrix formulations. Based thereon, when the curing step takes place in a convection curing device, the curing temperature can be defined and the curing time can be measured as the following.

In one embodiment, wherein the curing time is measured according to method 1, the curing temperature is defined to be the target inlet air temperature and the starting point of the curing step is defined to be the point in time when the inlet air temperature reaches the curing temperature. The end point of the curing step is defined to be (1) the point in time when the heating is stopped or at least reduced and the inlet air temperature subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., in a plateau-like temperature profile or (2) the point in time when the inlet air temperature drops below the curing temperature in a parabolic or triangular temperature profile. Preferably, the curing step starts according to method 1, when the inlet air temperature reaches a curing temperature of at least about 62° C., at least about 68° C. or at least about 70° C., more preferably, of at least about 72° C. or at least about 75° C. In a preferred embodiment, the temperature profile during the curing step shows a plateau-like form, wherein the curing temperature, i.e. the target inlet air temperature, is preferably at least about 72° C., for example about 75° C., and the curing time which is measured according to method 1 is preferably in the range of from about 15 minutes to about 2 hours, for example about 30 minutes or about 1 hour.

In another embodiment, wherein the curing time is measured according to method 2, the curing temperature is defined to be the target exhaust air temperature and the starting point of the curing step is defined to be the point in time when the exhaust air temperature reaches the curing temperature. The end point of the curing step is defined to be (1) the point in time when the heating is stopped or at least reduced and the exhaust air temperature subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., in a plateau-like temperature profile or (2) the point in time when the exhaust air temperature drops below the curing temperature in a parabolic or triangular temperature profile. Preferably, the curing step starts according to method 2, when the exhaust air temperature reaches a curing temperature of at least about 62° C., at least about 68° C. or at least about 70° C., more preferably, of at least about 72° C. or at least about 75° C. In preferred embodiments, the temperature profile during the curing step shows a plateau-like form, wherein the curing temperature, i.e. the target exhaust air temperature, is preferably at least about 68° C., at least about 70° C. or at least about 72° C., for example the target exhaust air temperature is about 68° C., about 70° C., about 72° C., about 75° C. or about 78° C., and the curing time which is measured according to method 2 is preferably in the range of from about 1 minute to about 2 hours, preferably from about 5 minutes to about 90 minutes, for example the curing time is about 5 minutes, about 10 minutes, about 15 minutes, about 30 minutes, about 60 minutes, about 70 minutes, about 75 minutes or about 90 minutes. In a more preferred embodiment, the curing time which is measured according to method 2 is in the range of from about 15 minutes to about 1 hour.

In a further embodiment, wherein the curing time is measured according to method 3, the curing temperature is defined to be the target temperature of the extended release matrix formulations and the starting point of the curing step is defined to be the point in time when the temperature of the extended release matrix formulations, which can be measured for example by an IR gun, reaches the curing temperature. The end point of the curing step is defined to be (1) the point in time when the heating is stopped or at least reduced and the temperature of the extended release matrix formulations subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., in a plateau-like temperature profile or (2) the point in time when the temperature of the extended release matrix formulations drops below the curing temperature in a parabolic or triangular temperature profile. Preferably, the curing step starts according to method 3, when the temperature of the extended release matrix formulations reaches a curing temperature of at least about 62° C., at least about 68° C. or at least about 70° C., more preferably, of at least about 72° C. or at least about 75° C.

In still another embodiment, wherein the curing time is measured according to method 4, the curing temperature is defined to be the target temperature measured using a temperature probe, such as a wire thermocouple, that was placed inside the curing device near the extended release matrix formulations and the starting point of the curing step is defined to be the point in time when the temperature measured using a temperature probe that was placed inside the curing device near the extended release matrix formulations reaches the curing temperature. The end point of the curing step is defined to be (1) the point in time when the heating is stopped or at least reduced and the temperature measured using the temperature probe subsequently drops below the curing temperature by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C., in a plateau-like temperature profile or (2) the point in time when the temperature measured using the temperature probe drops below the curing temperature in a parabolic or triangular temperature profile. Preferably, the curing step starts according to method 4, when the temperature measured using a temperature probe that was placed inside the curing device near the extended release matrix formulations reaches a curing temperature of at least about 62° C., at least about 68° C. or at least about 70° C., more preferably, of at least about 72° C. or at least about 75° C. In a preferred embodiment, the temperature profile during the curing step shows a plateau-like form, wherein the curing temperature, i.e. the target temperature measured using a temperature probe that was placed inside the curing device near the extended release matrix formulations, is preferably at least about 68° C., for example it is about 70° C., and the curing time which is measured according to method 4 is preferably in the range of from about 15 minutes to about 2 hours, for example the curing time is about 60 minutes or about 90 minutes.

If curing takes place in a convection curing device, the curing time can be measured by any one of methods 1, 2, 3 or 4. In a preferred embodiment, the curing time is measured according to method 2.

In certain embodiments, the curing temperature is defined as a target temperature range, for example the curing temperature is defined as a target inlet air temperature range or a target exhaust air temperature range. In such embodiments, the starting point of the curing step is defined to be the point in time when the lower limit of the target temperature range is reached, and the end point of the curing step is defined to be the point in time when the heating is stopped or at least reduced, and the temperature subsequently drops below the lower limit of the target temperature range by more than about 10° C. and/or below the lower limit of the softening temperature range of high molecular weight polyethylene oxide, for example below about 62° C.

The curing time, i.e. the time period the extended release matrix formulation is subjected to the curing temperature, which can for example be measured according to methods 1, 2, 3 and 4 as described above, is at least about 1 minute or at least about 5 minutes. The curing time may vary from about 1 minute to about 24 hours or from about 5 minutes to about 20 hours or from about 10 minutes to about 15 hours or from about 15 minutes to about 10 hours or from about 30 minutes to about 5 hours depending on the specific composition and on the formulation and the curing temperature. The parameter of the composition, the curing time and the curing temperature are chosen to achieve the tamper resistance as described herein. According to certain embodiments the curing time varies from about 15 minutes to about 30 minutes. According to further embodiments wherein the curing temperature is at least about 60° C. or at least about 62° C., preferably at least about 68° C., at least about 70° C., at least about 72° C. or at least about 75° C. or varies from about 62° C. to about 85° C. or from about 65° C. to about 85° C. the curing time is preferably at least about 15 minutes, at least about 30 minutes, at least about 60 minutes, at least about 75 minutes, at least about 90 minutes or about 120 minutes. In preferred embodiments, wherein the curing temperature is for example at least about 62° C., at least about 68° C. or at least about 70° C., preferably at least about 72° C. or at least about 75° C., or ranges from about 62° C. to about 80° C., from about 65° C. to about 80° C., from about 68° C. to about 80° C., from about 70° C. to about 80° C. or from about 72° C. to about 80° C., the curing time is preferably at least about 1 minute or at least about 5 minutes. More preferably, the curing time is at least about 10 minutes, at least about 15 minutes or at least about 30 minutes. In certain such embodiments, the curing time can be chosen to be as short as possible while still achieving the desired tamper resistance. For example, the curing time preferably does not exceed about 5 hours, more preferably it does not exceed about 3 hours and most preferably it does not exceed about 2 hours. Preferably, the curing time is in the range of from about 1 minute to about 5 hours, from about 5 minutes to about 3 hours, from about 15 minutes to about 2 hours or from about 15 minutes to about 1 hour. Any combination of the curing temperatures and the curing times as disclosed herein lies within the scope of the present invention.

In certain embodiments, the composition is only subjected to the curing temperature until the high molecular weight polyethylene oxide present in the extended release matrix formulation has reached its softening temperature and/or at least partially melts. In certain such embodiments, the curing time may be less than about 5 minutes, for example the curing time may vary from about 0 minutes to about 3 hours or from about 1 minute to about 2 hours or from about 2 minutes to about 1 hour. Instant curing is possible by choosing a curing device which allows for an instant heating of the high molecular weight polyethylene oxide in the extended release matrix formulation to at least its softening temperature, so that the high molecular weight polyethylene oxide at least partially melts. Such curing devices are for example microwave ovens, ultrasound devices, light irradiation apparatus such as UV-irradiation apparatus, ultra-high frequency (UHF) fields or any method known to the person skilled in the art.

The skilled person is aware that the size of the extended release matrix formulation may determine the required curing time and curing temperature to achieve the desired tamper resistance. Without wanting to be bound by any theory, it is believed that in the case of a large extended release matrix formulation, such as a large tablet, a longer curing time is necessary to conduct the heat into the interior of the formulation than in the case of a corresponding formulation with smaller size. Higher temperature increases the thermal conductivity rate and thereby decreases the required curing time.

The curing step c) may take place in an oven. Advantageously, the curing step c) takes place in a bed of free flowing extended release matrix formulations as e.g. in a coating pan. The coating pan allows an efficient batch wise curing step which can subsequently be followed by a coating step without the need to transfer the dosage forms, e.g. the tablets. Such a process may comprise the steps of:

-   -   (a) combining at least         -   (1) at least one polyethylene oxide having, based on             rheological measurements, an approximate molecular weight of             at least 1,000,000, and         -   (2) at least one active agent,         -   to form a composition;     -   (b) shaping said composition to form the extended release matrix         formulation in the form of a tablet by direct compression;     -   (c) curing said tablet by         -   subjecting a bed of free flowing tablets to a temperature             from about 62° C. to about 90° C., preferably from about             70° C. to about 90° C. for a time period of at least about 1             minute or at least about 5 minutes, preferably of at least             about 30 minutes, in a coating pan and         -   subsequently cooling the bed of free flowing tablets to a             temperature of below about 50° C.;         -   and subsequently     -   (d) coating the dosage form in said coating pan.

In certain embodiments, an additional curing step can follow after step d) of coating the dosage form. An additional curing step can be performed as described for curing step c). In certain such embodiments, the curing temperature of the additional curing step is preferably at least about 70° C., at least about 72° C. or at least about 75° C., and the curing time is preferably in the range of from about 15 minutes to about 1 hour, for example about 30 minutes.

In certain embodiments an antioxidant, e.g. BHT (butylated hydroxytoluene) is added to the composition.

In certain embodiments, the curing step c) leads to a decrease in the density of the extended release matrix formulation, such that the density of the cured extended release matrix formulation is lower than the density of the extended release matrix formulation prior to the curing step c). Preferably, the density of the cured extended release matrix formulation in comparison to the density of the uncured extended release matrix formulation decreases by at least about 0.5%. More preferably, the density of the cured extended release matrix formulation in comparison to the density of the uncured extended release matrix formulation decreases by at least about 0.7%, at least about 0.8%, at least about 1.0%, at least about 2.0% or at least about 2.5%. Without wanting to be bound by any theory, it is believed that the extended release matrix formulation, due to the absence of elevated pressure during the curing step c), expands, resulting in a density decrease.

According to a further aspect of the invention, the density of the extended release matrix formulation in the solid oral extended release pharmaceutical dosage form, preferably in a dosage form containing oxycodone HCl as active agent, is equal to or less than about 1.20 g/cm³. Preferably, it is equal to or less than about 1.19 g/cm³, equal to or less than about 1.18 g/cm³, or equal to or less than about 1.17 g/cm³. For example, the density of the extended release matrix formulation is in the range of from about 1.10 g/cm³ to about 1.20 g/cm³, from about 1.11 g/cm³ to about 1.20 g/cm³, or from about 1.11 g/cm³ to about 1.19 g/cm³. Preferably it is in the range of from about 1.12 g/cm³ to about 1.19 g/cm³ or from about 1.13 g/cm³ to about 1.19 g/cm³, more preferably from about 1.13 g/cm³ to about 1.18 g/cm³.

The density of the extended release matrix formulation is preferably determined by Archimedes Principle using a liquid of known density (ρ₀). The extended release matrix formulation is first weighed in air and then immersed in a liquid and weighed. From these two weights, the density of the extended release matrix formulation ρ can be determined by the equation:

$\rho = {\frac{A}{A - B} \cdot \rho_{0}}$

wherein ρ is the density of the extended release matrix formulation, A is the weight of the extended release matrix formulation in air, B is the weight of the extended release matrix formulation when immersed in a liquid and ρ₀ is the density of the liquid at a given temperature. A suitable liquid of known density ρ₀ is for example hexane.

Preferably, the density of an extended release matrix formulation is measured using a Top-loading Mettler Toledo balance Model # AB 135-S/FACT, Serial #1127430072 and a density determination kit 33360. Preferably, hexane is used as liquid of known density ρ₀.

The density values throughout this document correspond to the density of the extended release matrix formulation at room temperature.

The density of the extended release matrix formulation preferably refers to the density of the uncoated formulation, for example to the density of a core tablet. In those embodiments, wherein the extended release matrix formulation is coated, for example wherein the extended release matrix formulation is subjected to a coating step d) after the curing step c), the density of the extended release matrix formulation is preferably measured prior to performing the coating step, or by removing the coating from a coated extended release matrix formulation and subsequently measuring the density of the uncoated extended release matrix formulation.

In the above described embodiments high molecular weight polyethylene oxide having, based on rheological measurements, an approximate molecular weight of from 2,000,000 to 15,000,000 or from 2,000,000 to 8,000,000 may be used. In particular polyethylene oxides having, based on rheological measurements, an approximate molecular weight of 2,000,000, 4,000,000, 7,000,000 or 8,000,000 may be used. In particular polyethylene oxides having, based on rheological measurements, an approximate molecular weight of 4,000,000, may be used.

In embodiments wherein the composition further comprises at least one low molecular weight polyethylene oxide is used polyethylene oxides having, based on rheological measurements, an approximate molecular weight of less than 1,000,000, such as polyethylene oxides having, based on rheological measurements, an approximate molecular weight of from 100,000 to 900,000 may be used. The addition of such low molecular weight polyethylene oxides may be used to specifically tailor the release rate such as enhance the release rate of a formulation that otherwise provides a release rate to slow for the specific purpose. In such embodiments at least one polyethylene oxide having, based on rheological measurements, an approximate molecular weight of 100,000 may be used.

In certain such embodiments the composition comprises at least one polyethylene oxide having, based on rheological measurements, an approximate molecular weight of at least 1,000,000 and at least one polyethylene oxide having, based on rheological measurements, an approximate molecular weight of less than 1,000,000, wherein the composition comprises at least about 10% (by wt) or at least about 20% (by wt) of the polyethylene oxide having, based on rheological measurements, an approximate molecular weight of less than 1,000,000. In certain such embodiments the curing temperature is less than about 80° C. or even less than about 77° C.

In certain embodiments the overall content of polyethylene oxide in the composition is at least about 80% (by wt). Without wanting to be bound to any theory it is believed that high contents of polyethylene oxide provide for the tamper resistance as described herein, such as the breaking strength and the resistance to alcohol extraction. According to certain such embodiments the active agent is oxycodone hydrochloride and the composition comprises more than about 5% (by wt) of the oxycodone hydrochloride.

In certain such embodiments the content in the composition of the at least one polyethylene oxide having, based on rheological measurements, an approximate molecular weight of at least 1,000,000 is at least about 80% (by wt). In certain embodiments the content in the composition of the at least one polyethylene oxide having, based on rheological measurements, an approximate molecular weight of at least 1,000,000 is at least about 85% or at least about 90% (by wt). In such embodiments a polyethylene oxide having, based on rheological measurements, an approximate molecular weight of at least 4,000,000 or at least 7,000,000 may be employed. In certain such embodiments the active agent is oxycodone hydrochloride or hydromorphone hydrochloride, although other active agents can also be used according to this aspect of the invention, and the composition comprises more than about 5% (by wt) oxycodone hydrochloride or hydromorphone hydrochloride.

In certain embodiments wherein the amount of drug in the composition is at least about 20% (by wt) the polyethylene oxide content may be as low as about 75% (by wt). In another embodiment, wherein the amount of drug in the composition is in the range of from about 25% (by wt) to about 35% (by wt), the polyethylene oxide content may be in the range of from about 65% (by wt) to about 75% (by wt). For example, in embodiments wherein the amount of drug in the composition is about 32% (by wt) the polyethylene oxide content may be about 67% (by wt).

In certain embodiments of the invention magnesium stearate is added during or after the curing process/curing step in order to avoid that the tablets stick together. In certain such embodiments the magnesium stearate is added at the end of the curing process/curing step before cooling the tablets or during the cooling of the tablets. Other anti-tacking agents that could be used would be talc, silica, fumed silica, colloidal silica dioxide, calcium stearate, carnauba wax, long chain fatty alcohols and waxes, such as stearic acid and stearyl alcohol, mineral oil, paraffin, micro crystalline cellulose, glycerin, propylene glycol, and polyethylene glycol. Additionally or alternatively the coating can be started at the high temperature.

In certain embodiments, wherein curing step c) is carried out in a coating pan, sticking of tablets can be avoided or sticking tablets can be separated by increasing the pan speed during the curing step or after the curing step, in the latter case for example before or during the cooling of the tablets. The pan speed is increased up to a speed where all tablets are separated or no sticking occurs.

In certain embodiments of the invention, an initial film coating or a fraction of a film coating is applied prior to performing curing step c). This film coating provides an “overcoat” for the extended release matrix formulations or tablets to function as an anti-tacking agent, i.e. in order to avoid that the formulations or tablets stick together. In certain such embodiments the film coating which is applied prior to the curing step is an Opadry film coating. After the curing step c), a further film coating step can be performed.

The present invention encompasses also any solid oral extended release pharmaceutical dosage form obtainable by a process according to any process as described above.

Independently, the present invention is also directed to solid oral extended release pharmaceutical dosage forms.

In certain embodiments the invention is directed to solid oral extended release pharmaceutical dosage forms comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates, wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points at each of said time points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates.

In certain such embodiments the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points or no more than about 15% points at each of said time points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates and the non-flattened reference tablet or reference multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours.

In certain such embodiments, the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates and the non-flattened reference tablet or reference multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours or is between about 5 and about 30% (by wt) active agent released after 0.5 hours or is between about 5 and about 20% (by wt) active agent released after 0.5 hours or is between about 10 and about 18% (by wt) active agent released after 0.5 hours.

In certain embodiments the invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates, wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points at each time point from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and non flattened reference tablet or flattened and non flattened reference multi particulates, respectively.

In certain such embodiments the tablet or the multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60%, or no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the individual multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points or no more than about 15% points at each of said time points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and a non flattened reference tablet or reference multi particulates, respectively.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation comprising an active agent in the form of a tablet or multi particulates,

wherein the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) comprising 40% or 0% ethanol at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours.

In certain such embodiments, the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% or 0% ethanol at 37° C., is between about 5 and about 40% (by wt) active agent released after 0.5 hours or is between about 5 and about 30% (by wt) active agent released after 0.5 hours or is between about 5 and about 20% (by wt) active agent released after 0.5 hours or is between about 10 and about 18% (by wt) active agent released after 0.5 hours.

Such dosage forms may be prepared as described above.

In certain embodiments the invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent, preferably selected from opioid         analgesics; and         wherein the composition comprises at least about 80% (by wt)         polyethylene oxide. The composition may also comprise at least         about 85 or 90% (by wt) polyethylene oxide. According to certain         such embodiments wherein the composition comprises at least         about 80% (by wt) polyethylene oxide, the active agent is         oxycodone hydrochloride or hydromorphone hydrochloride and the         composition comprises more than about 5% (by wt) of the         oxycodone hydrochloride or hydromorphone hydrochloride.

In certain such embodiments the composition comprises at least about 80% (by wt) polyethylene oxide having, based on rheological measurements, an approximate molecular weight of at least 1,000,000.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 10 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 85% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 15 mg or 20 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 40 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 65% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 60 mg or 80 mg oxycodone hydrochloride; and

wherein the composition comprises at least about 60% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000;     -   and

(2) 8 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 94% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 12 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 92% (by wt) polyethylene oxide.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) 32 mg hydromorphone hydrochloride; and

wherein the composition comprises at least about 90% (by wt) polyethylene oxide.

In certain embodiments the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising a composition comprising at least:

-   -   (1) at least one active agent, preferably selected from opioid         analgesics;     -   (2) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (3) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of less than         1,000,000. In certain such embodiments the composition comprises         at least about 80% (by wt) of polyethylene oxide. The         composition may also comprise at least about 85 or 90% (by wt)         polyethylene oxide. According to certain such embodiments         wherein the composition comprises at least about 80% (by wt)         polyethylene oxide, the active agent is oxycodone hydrochloride         or hydromorphone hydrochloride and the composition comprises         more than about 5% (by wt) of the oxycodone hydrochloride or the         hydromorphone hydrochloride. The composition may also comprise         15 to 30% (by wt) of polyethylene oxide having, based on         rheological measurements, a molecular weight of at least         1,000,000; and 65 to 80% (by wt) polyethylene oxide having,         based on rheological measurements, a molecular weight of less         than 1,000,000, or the composition may comprise at least about         20% (by wt) or at least about 30% (by wt) or at least about 50%         (by wt) of polyethylene oxide having, based on rheological         measurements, a molecular weight of at least 1,000,000.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, a molecular weight of at least 800,000 or at least         900,000; and     -   (2) at least one active agent selected from opioid analgesics;         and

wherein the composition comprises at least about 80% (by wt) polyethylene oxide.

In certain embodiments of the invention the extended release matrix has a density which is equal to or less than about 1.20 g/cm³. In certain such embodiments, the density of the extended release matrix formulation is equal to or less than about 1.19 g/cm³, preferably equal to or less than about 1.18 g/cm³ or equal to or less than about 1.17 g/cm³. For example, the density of the extended release matrix formulation is in the range of from about 1.10 g/cm³ to about 1.20 g/cm³, from about 1.11 g/cm³ to about 1.20 g/cm³, or from about 1.11 g/cm³ to about 1.19 g/cm³. Preferably it is in the range of from about 1.12 g/cm³ to about 1.19 g/cm³ or from about 1.13 g/cm³ to about 1.19 g/cm³, more preferably from about 1.13 g/cm³ to about 1.18 g/cm³. Preferably, the density is determined by Archimedes principle, as described above.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent; and

wherein the extended release matrix formulation when subjected to an indentation test has a cracking force of at least about 110 N.

In certain embodiments of the invention the extended release matrix formulation has a cracking force of at least about 110 N, preferably of at least about 120 N, at least about 130 N or at least about 140 N, more preferably of at least about 150 N, at least about 160 N or at least about 170 N, most preferably of at least about 180 N, at least about 190 N or at least about 200 N.

In certain embodiments, the present invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, the extended release matrix formulation comprising

a composition comprising at least:

-   -   (1) at least one polyethylene oxide having, based on rheological         measurements, an approximate molecular weight of at least         1,000,000; and     -   (2) at least one active agent; and

wherein the extended release matrix formulation when subjected to an indentation test has a “penetration depth to crack distance” of at least about 1.0 mm.

In certain embodiments of the invention the extended release matrix formulation has a “penetration depth to crack” distance of at least about 1.0 mm or at least about 1.2 mm, preferably of at least about 1.4 mm, at least about 1.5 mm or at least about 1.6 mm, more preferably of at least about 1.8 mm, at least about 1.9 mm or at least about 2.0 mm, most preferably of at least about 2.2 mm, at least about 2.4 mm or at least about 2.6 mm.

In certain such embodiments of the invention the extended release matrix formulation has a cracking force of at least about 110 N, preferably of at least about 120 N, at least about 130 N or at least about 140 N, more preferably of at least about 150 N, at least about 160 N or at least about 170 N, most preferably of at least about 180 N, at least about 190 N or at least about 200 N, and/or a “penetration depth to crack” distance of at least about 1.0 mm or at least about 1.2 mm, preferably of at least about 1.4 mm, at least about 1.5 mm or at least about 1.6 mm, more preferably of at least about 1.8 mm, at least about 1.9 mm or at least about 2.0 mm, most preferably of at least about 2.2 mm, at least about 2.4 mm or at least about 2.6 mm. A combination of any of the aforementioned values of cracking force and “penetration depth to crack” distance is included in the scope of the present invention.

In certain such embodiments the extended release matrix formulation when subjected to an indentation test resists a work of at least about 0.06 J or at least about 0.08 J, preferably of at least about 0.09 J, at least about 0.11 J or at least about 0.13 J, more preferably of at least about 0.15 J, at least about 0.17 J or at least about 0.19 J, most preferably of at least about 0.21 J, at least about 0.23 J or at least about 0.25 J, without cracking.

The parameters “cracking force”, “penetration depth to crack distance” and “work” are determined in an indentation test as described above, using a Texture Analyzer such as the TA-XT2 Texture Analyzer (Texture Technologies Corp., 18 Fairview Road, Scarsdale, N.Y. 10583). The cracking force and/or “penetration depth to crack” distance can be determined using an uncoated or a coated extended release matrix formulation. Preferably, the cracking force and/or “penetration depth to crack” distance are determined on the uncoated extended release matrix formulation. Without wanting to be bound by any theory, it is believed that a coating, such as the coating applied in step d) of the manufacturing process of the solid oral extended release pharmaceutical dosage form as described above, does not significantly contribute to the observed cracking force and/or “penetration depth to crack” distance. Therefore, the cracking force and/or “penetration depth to crack” distance determined for a specific coated extended release matrix formulation are not expected to vary substantially from the values determined for the corresponding uncoated extended release matrix formulation.

In certain embodiments the extended release matrix formulation is in the form of a tablet or multi particulates, and the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening. Preferably, the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening.

Preferably, the flattening of the tablets or the individual multi particulates is performed with a bench press, such as a carver style bench press, or with a hammer, as described above.

In certain such embodiments the extended release matrix formulation is in the form of a tablet or multi particulates, and the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points at each of said time points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates. Preferably, the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein said flattened tablet or the flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points or no more than about 15% points at each of said time points from the corresponding in-vitro dissolution rate of a non-flattened reference tablet or reference multi particulates.

In certain embodiments the invention is directed to a solid oral extended release pharmaceutical dosage form comprising an extended release matrix formulation, wherein the extended release matrix formulation is in the form of a tablet or multi particulates, and the tablet or the individual multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or of the individual multi particulate after the flattening which corresponds to no more than about 60% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the flattened or non flattened multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points at each time points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and non flattened reference tablet or flattened and non flattened reference multi particulates, respectively. Preferably, the tablet or the multi particulates can at least be flattened without breaking, characterized by a thickness of the tablet or the individual multi particulate after the flattening which corresponds to no more than about 60%, or no more than about 50%, or no more than about 40%, or no more than about 30%, or no more than about 20%, or no more than about 16% of the thickness of the tablet or the individual multi particulate before flattening, and wherein the flattened or non flattened tablet or the individual multi particulates provide an in-vitro dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) comprising 40% ethanol at 37° C., characterized by the percent amount of active released at 0.5 hours or at 0.5 and 0.75 hours, or at 0.5, 0.75 and 1 hours, or at 0.5, 0.75, 1 and 1.5 hours or at 0.5, 0.75, 1, 1.5 and 2 hours of dissolution that deviates no more than about 20% points or no more than about 15% points at each of said time points from the corresponding in-vitro dissolution rate measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. without ethanol, using a flattened and a non flattened reference tablet or reference multi particulates, respectively.

In certain such embodiments the extended release matrix formulation, when subjected to a maximum force of about 196 N or about 439 N in a tablet hardness test, does not break.

Preferably, the tablet hardness test to determine the breaking strength of extended release matrix formulations is performed in a Schleuniger Apparatus as described above. For example, the breaking strength is determined using a Schleuniger 2E/106 Apparatus and applying a force of a maximum of about 196 N, or a Schleuniger Model 6D Apparatus and applying a force of a maximum of about 439 N.

It has also been observed that formulations of the present invention are storage stable, wherein the extended release matrix formulation after having been stored at 25° C. and 60% relative humidity (RH) or 40° C. and 75% relative humidity (RH) for at least 1 month, more preferably for at least 2 months, for at least 3 months or for at least 6 months, provides a dissolution rate, when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., characterized by the percent amount of active released at 1 hours or at 1 and 2 hours, or at 1 and 4 hours, or at 1, 2 and 4 hours, or at 1, 4 and 12 hours, or at 1, 2, 4 and 8 hours or at 1, 2, 4, 8 and 12 hours of dissolution that deviates no more than about 15% points, preferably no more than about 12% points or no more than about 10% points, more preferably no more than about 8% points or no more than about 6% points, most preferably no more than about 5% points at each of said time points from the corresponding in-vitro dissolution rate of a reference formulation prior to storage. Preferably, the extended release matrix formulation is stored in count bottles, such as 100 count bottles. Any combination of the aforementioned storage times, dissolution time points and deviation limits lies within the scope of the present invention.

According to a further storage stability aspect the extended release matrix formulation after having been stored at 25° C. and 60% relative humidity (RH) or at 40° C. and 75% relative humidity (RH) for at least 1 month, more preferably for at least 2 months, for at least 3 months or for at least 6 months, contains an amount of the at least one active agent in % (by wt) relative to the label claim of the active agent for the extended release matrix formulation that deviates no more than about 10% points, preferably no more than about 8% points or no more than about 6% points, more preferably no more than about 5% points or no more than about 4% points or no more than about 3% points from the corresponding amount of active agent in % (by wt) relative to the label claim of the active agent for the extended release matrix formulation of a reference formulation prior to storage. Preferably, the extended release matrix formulation is stored in count bottles, such as 100 count bottles. Any combination of the aforementioned storage times and deviation limits lies within the scope of the present invention.

According to certain such embodiments the active agent is oxycodone hydrochloride.

Preferably, the amount of the at least one active agent in % (by wt) relative to the label claim of the active agent for the extended release matrix formulation is determined by extracting the at least one active agent from the extended release matrix formulation and subsequent analysis using high performance liquid chromatography. In certain embodiments, wherein the at least one active agent is oxycodone hydrochloride, preferably the amount of oxycodone hydrochloride in % (by wt) relative to the label claim of oxycodone hydrochloride for the extended release matrix formulation is determined by extracting the oxycodone hydrochloride from the extended release matrix formulation with a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring until the extended release matrix formulation is completely dispersed or for overnight and subsequent analysis using high performance liquid chromatography, preferably reversed-phase high performance liquid chromatography. In certain such embodiments, wherein the extended release matrix formulation is in the form of tablets, preferably the amount of oxycodone hydrochloride in % (by wt) relative to the label claim of oxycodone hydrochloride for the tablets is determined by extracting oxycodone hydrochloride from two sets of ten tablets each with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring until the tablets are completely dispersed or for overnight and subsequent analysis using high performance liquid chromatography, preferably reversed-phase high performance liquid chromatography. Preferably, the assay results are mean values on two measurements.

In certain embodiments the invention is directed to a solid oral extended release pharmaceutical dosage form wherein the dosage form provides a dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., is between 12.5 and 55% (by wt) active agent released after 1 hour, between 25 and 65% (by wt) active agent released after 2 hours, between 45 and 85% (by wt) active agent released after 4 hours and between 55 and 95% (by wt) active agent released after 6 hours, and optionally between 75 and 100% (by wt) active agent released after 8 hours. Preferably, the dosage form provides a dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., between 15 and 45% (by wt) active released after 1 hour, is between 30 and 60% (by wt) active agent released after 2 hours, between 50 and 80% (by wt) active agent released after 4 hours and between 60 and 90% (by wt) active agent released after 6 hours and optionally between 80 and 100% (by wt) active agent released after 8 hours. More preferably, the dosage form provides a dissolution rate, which when measured in a USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., is between 17.5 and 35% (by wt) active agent released after 1 hour, between 35 and 55% (by wt) active agent released after 2 hours, between 55 and 75% (by wt) active agent released after 4 hours and between 65 and 85% (by wt) active agent released after 6 hours and optionally between 85 and 100% (by wt) active agent released after 8 hours.

In certain such embodiments the active agent is oxycodone hydrochloride or hydromorphone hydrochloride.

Such dosage forms may be prepared by the process as described herein.

In embodiments as described above the tablet may be formed by direct compression of the composition and cured by at least subjecting said tablet to a temperature of at least about 60° C., at least about 62° C., at least about 68° C., at least about 70° C., at least about 72° C. or at least about 75° C. for a time period of at least about 1 minute, at least about 5 minutes or at least about 15 minutes.

In certain embodiments of the invention the tablet as described above may be over coated with a polyethylene oxide powder layer by applying to the cured or uncured tablet a powder layer of polyethylene oxide surrounding the core and cure the powder layered tablet as described above. Such an outer polyethylene oxide layer provides a lag time before the release of the active agent starts and/or a slower overall release rate.

In certain embodiments of the invention a stacked bi or multi layered tablet is manufactured, wherein at least one of the layers contains an extended release formulation as described above and at least one of the other layers contains an immediate release formulation of the active agent contained by the extended release formulation or a second different active agent. In certain such embodiments the tablet is a bi layered tablet with on extended release formulation layer as described herein and an immediate release formulation layer. In certain such embodiments, in particular the bi layered tablets, opioid analgesics are contained by the extended release layer and further non opioid analgesics are contained by the immediate release layer. Non opioid analgesics may be non steroidal anti inflammatory agents but also non opioid analgesics such as acetaminophen. Acetaminophen can e.g. be used in combination with hydrocodone as opioid analgesic. Such tablets can be prepared by specific tablet compression techniques which allow the compression of at least two compositions to form tablets with at least two distinct stacked layers each comprising one of the at least two compositions. For example, such tablets can be manufactured in a tablet press by filling the compression tool with the first composition and compressing said first composition and subsequently filling on top of the compressed first composition the second composition and subsequently compressing the two compositions to form the final layered tablet. The immediate release composition may be any composition as known in the art.

The invention also encompasses the use of high molecular weight polyethylene oxide that has, based on rheological measurements, an approximate molecular weight of at least 1,000,000, as matrix forming material in the manufacture of a solid extended release oral dosage form comprising an active selected from opioids for imparting to the solid extended release oral dosage form resistance to alcohol extraction. The use may be accomplished as described herein with respect to the described process or the described formulations or in any other way as conventional in the art.

It has been observed that the formulations of the present invention comprising a high molecular weight polyethylene oxide can be flattened to a thickness of between about 15 and about 18% of the non flattened thickness and that the flat tablet resumes in part or substantially resumes its initial non flattened shape during dissolution, neglecting the swelling that also takes place during dissolution, i.e. the thickness of the tablet increases and the diameter decreases considerably during dissolution. Without wanting to be bound to any theory it is believed that the high molecular weight polyethylene oxide has a form memory and the ability to restore the initial form after deformation, e.g. after flattening, in an environment that allows the restoration, such as an aqueous environment used in dissolution tests. This ability is believed to contribute to the tamper resistance, in particular the alcohol resistance of the dosage forms of the present invention.

The invention also encompasses the method of treatment wherein a dosage form is administered for treatment of a disease or certain condition of a patient that requires treatment in particular pain and the use of a dosage form according to the invention for the manufacture of a medicament for the treatment of a disease or certain condition of a patient that requires treatment in particular pain.

In one aspect of the present invention, a twice-a-day solid oral extended release pharmaceutical dosage form is provided which provides a mean t_(max) at about 2 to about 6 hours or at about 2.5 to about 5.5 hours or at about 2.5 to about 5 hours after administration at steady state or of a single dose to human subjects. The dosage form may comprises oxycodone or a salt thereof or hydromorphone or a salt thereof.

In one aspect of the present invention, a once-a-day solid oral extended release pharmaceutical dosage form is provided which provides a mean t_(max) at about 3 to about 10 hours or at about 4 to about 9 hours or at about 5 to about 8 hours after administration at steady state or of a single dose to human subjects. The dosage form may comprises oxycodone or a salt thereof or hydromorphone or a salt thereof.

In a further aspect of the present invention, a twice-a-day solid oral extended release pharmaceutical dosage form is provided, wherein the dosage form comprises oxycodone or a salt thereof in an amount of from about 10 mg to about 160 mg and wherein the dosage form provides a mean maximum plasma concentration (C_(max)) of oxycodone up to about 240 ng/mL or from about 6 ng/mL to about 240 ng/mL after administration at steady state or of a single dose to human subjects.

In a further aspect of the present invention, a solid oral extended release pharmaceutical dosage form is provided, wherein the dosage form comprises oxycodone or a salt thereof in an amount of from about 10 mg to about 40 mg and wherein the dosage form provides a mean maximum plasma concentration (C_(max)) of oxycodone from about 6 ng/mL to about 60 ng/mL after administration at steady state or of a single dose to human subjects.

In a further aspect of the invention a solid oral extended release pharmaceutical dosage form is provided that is bioequivalent to the commercial product OxyContin™.

In a further aspect of the invention a solid oral extended release pharmaceutical dosage form is provided that is bioequivalent to the commercial product Palladone™ as sold in the United States in 2005.

In a further aspect of the invention, a solid oral extended release pharmaceutical dosage form is provided, wherein the active agent is oxycodone hydrochloride and

wherein a dosage form comprising 10 mg of oxycodone hydrochloride when tested in a comparative clinical study is bioequivalent to a reference tablet containing 10 mg of oxycodone hydrochloride in a matrix formulation containing:

a) Oxycodone hydrochloride: 10.0 mg/tablet

b) Lactose (spray-dried): 69.25 mg/tablet

c) Povidone: 5.0 mg/tablet

d) Eudragit® RS 30D (solids): 10.0 mg/tablet

e) Triacetin®: 2.0 mg/tablet

f) Stearyl alcohol: 25.0 mg/tablet

g) Talc: 2.5 mg/tablet

h) Magnesium Stearate: 1.25 mg/tablet;

and wherein the reference tablet is prepared by the following steps:

-   1. Eudragit® RS 30D and Triacetin® are combined while passing     through a 60 mesh screen, and mixed under low shear for     approximately 5 minutes or until a uniform dispersion is observed. -   2. Oxycodone HCl, lactose, and povidone are placed into a fluid bed     granulator/dryer (FBD) bowl, and the suspension sprayed onto the     powder in the fluid bed. -   3. After spraying, the granulation is passed through a #12 screen if     necessary to reduce lumps. -   4. The dry granulation is placed in a mixer. -   5. In the meantime, the required amount of stearyl alcohol is melted     at a temperature of approximately 70° C. -   6. The melted stearyl alcohol is incorporated into the granulation     while mixing. -   7. The waxed granulation is transferred to a fluid bed     granulator/dryer or trays and allowed to cool to room temperature or     below. -   8. The cooled granulation is then passed through a #12 screen. -   9. The waxed granulation is placed in a mixer/blender and lubricated     with the required amounts of talc and magnesium stearate for     approximately 3 minutes. -   10. The granulate is compressed into 125 mg tablets on a suitable     tabletting machine.

Pharmacokinetic parameters such as C_(max) and t_(max), AUC_(t), AUC_(inf), etc. describing the blood plasma curve can be obtained in clinical trials, first by single-dose administration of the active agent, e.g. oxycodone to a number of test persons, such as healthy human subjects. The blood plasma values of the individual test persons are then averaged, e.g. a mean AUC, C_(max) and t_(max) value is obtained. In the context of the present invention, pharmacokinetic parameters such as AUC, C_(max) and t_(max) refer to mean values. Further, in the context of the present invention, in vivo parameters such as values for AUC, C_(max), t_(max), or analgesic efficacy refer to parameters or values obtained after administration at steady state or of a single dose to human patients.

The C_(max) value indicates the maximum blood plasma concentration of the active agent. The t_(max) value indicates the time point at which the C_(max) value is reached. In other words, t_(max) is the time point of the maximum observed plasma concentration.

The AUC (Area Under the Curve) value corresponds to the area of the concentration curve. The AUC value is proportional to the amount of active agent absorbed into the blood circulation in total and is hence a measure for the bioavailability.

The AUC_(t) value corresponds to the area under the plasma concentration-time curve from the time of administration to the last measurable plasma concentration and is calculated by the linear up/log down trapezoidal rule.

AUC_(inf) is the area under the plasma concentration-time curve extrapolated to infinity and is calculated using the formula:

${AUC}_{\inf} = {{AUC}_{t} + \frac{C_{t}}{\lambda_{Z}}}$

where C_(t) is the last measurable plasma concentration and λ_(Z) is the apparent terminal phase rate constant.

λ_(Z) is the apparent terminal phase rate constant, where λ_(Z) is the magnitude of the slope of the linear regression of the log concentration versus time profile during the terminal phase.

t_(1/2Z) is the apparent plasma terminal phase half-life and is commonly determined as t_(1/2Z)=(ln 2)/λ_(Z).

The lag time t_(lag) is estimated as the timepoint immediately prior to the first measurable plasma concentration value.

The term “healthy” human subject refers to a male or female with average values as regards height, weight and physiological parameters, such as blood pressure, etc. Healthy human subjects for the purposes of the present invention are selected according to inclusion and exclusion criteria which are based on and in accordance with recommendations of the International Conference for Harmonization of Clinical Trials (ICH).

Thus, inclusion criteria comprise males and females aged between 18 to 50 years, inclusive, a body weight ranging from 50 to 100 kg (110 to 220 lbs) and a Body Mass Index (BMI) ≧18 and ≦34 (kg/m²), that subjects are healthy and free of significant abnormal findings as determined by medical history, physical examination, vital signs, and electrocardiogram, that females of child-bearing potential must be using an adequate and reliable method of contraception, such as a barrier with additional spermicide foam or jelly, an intra-uterine device, hormonal contraception (hormonal contraceptives alone are not acceptable), that females who are postmenopausal must have been postmenopausal ≧1 year and have elevated serum follicle stimulating hormone (FSH), and that subjects are willing to eat all the food supplied during the study.

A further inclusion criterium may be that subjects will refrain from strenuous exercise during the entire study and that they will not begin a new exercise program nor participate in any unusually strenuous physical exertion.

Exclusion criteria comprise that females are pregnant (positive beta human chorionic gonadotropin test) or lactating, any history of or current drug or alcohol abuse for five years, a history of or any current conditions that might interfere with drug absorption, distribution, metabolism or excretion, use of an opioid-containing medication in the past thirty (30) days, a history of known sensitivity to oxycodone, naltrexone, or related compounds, any history of frequent nausea or emesis regardless of etiology, any history of seizures or head trauma with current sequelae, participation in a clinical drug study during the thirty (30) days preceding the initial dose in this study, any significant illness during the thirty (30) days preceding the initial dose in this study, use of any medication including thyroid hormone replacement therapy (hormonal contraception is allowed), vitamins, herbal, and/or mineral supplements, during the 7 days preceding the initial dose, refusal to abstain from food for 10 hours preceding and 4 hours following administration or for 4 hours following administration of the study drugs and to abstain from caffeine or xanthine entirely during each confinement, consumption of alcoholic beverages within forty-eight (48) hours of initial study drug administration (Day 1) or anytime following initial study drug administration, history of smoking or use of nicotine products within 45 days of study drug administration or a positive urine cotinine test, blood or blood products donated within 30 days prior to administration of the study drugs or anytime during the study, except as required by the clinical study protocol, positive results for urine drug screen, alcohol screen at check-in of each period, and hepatitis B surface antigen (HBsAg), hepatitis B surface antibody HBsAb (unless immunized), hepatitis C antibody (anti-HCV), a positive Naloxone HCl challenge test, presence of Gilbert's Syndrome or any known hepatobiliary abnormalities and that the Investigator believes the subject to be unsuitable for reason(s) not specifically stated above.

Subjects meeting all the inclusion criteria and none of the exclusion criteria will be randomized into the study.

The enrolled population is the group of subjects who provide informed consent.

The randomized safety population is the group of subjects who are randomized, receive study drug, and have at least one post dose safety assessment.

The full analysis population for PK metrics will be the group of subjects who are randomized, receive study drug, and have at least one valid PK metric. Subjects experiencing emesis within 12 hours after dosing might be included based on visual inspection of the PK profiles prior to database lock. Subjects and profiles/metrics excluded from the analysis set will be documented in the Statistical Analysis Plan.

For the Naloxone HCl challenge test, vital signs and pulse oximetry (SPO₂) are obtained prior to the Naloxone HCl challenge test. The Naloxone HCl challenge may be administered intravenously or subcutaneously. For the intravenous route, the needle or cannula should remain in the arm during administration. 0.2 mg of Naloxone HCl (0.5 mL) are administered by intravenous injection. The subject is observed for 30 seconds for evidence of withdrawal signs or symptoms. Then 0.6 mg of Naloxone HCl (1.5 mL) are administered by intravenous injection. The subject is observed for 20 minutes for signs and symptoms of withdrawal. For the subcutaneous route, 0.8 mg of Naloxone HCl (2.0 mL) are administered and the subject is observed for 20 minutes for signs and symptoms of withdrawal. Following the 20-minute observation, post-Naloxone HCl challenge test vital signs and SPO₂ are obtained.

Vital signs include systolic blood pressure, diastolic blood pressure, pulse rate, respiratory rate, and oral temperature.

For the “How Do You Feel?” Inquiry, subjects will be asked a non-leading “How Do You Feel?” question such as “Have there been any changes in your health status since screening/since you were last asked?” at each vital sign measurement. Subject's response will be assessed to determine whether an adverse event is to be reported. Subjects will also be encouraged to voluntarily report adverse events occurring at any other time during the study.

Each subject receiving a fed treatment will consume a standard high-fat content meal in accordance with the “Guidance for Industry: Food-Effect Bioavailability and Fed Bioequivalence Studies” (US Department of Health and Human Services, Food and Drug Administration, Center for Drug Evaluation and Research, December 2002). The meal will be provided 30 minutes before dosing and will be eaten at a steady rate over a 25-minute period so that it is completed by 5 minutes before dosing.

Clinical laboratory evaluations performed in the course of clinical studies include biochemistry (fasted at least 10 hours), hematology, serology, urinalysis, screen for drugs of abuse, and further tests.

Biochemistry evaluations (fasted at least 10 hours) include determination of albumin, Alkaline Phosphatase, alanine aminotransferase (alanine transaminase, ALT), aspartate aminotransferase (aspartate transaminase, AST), calcium, chloride, creatinine, glucose, inorganic phosphate, potassium, sodium, total bilirubin, total protein, urea, lactate dehydrogenase (LDH), direct bilirubin and CO₂.

Hematology evaluations include determination of hematocrit, hemoglobin, platelet count, red blood cell count, white blood cell count, white blood cell differential (% and absolute): basophils, eosinophils, lymphocytes, monocytes and neutrophils.

Serology evaluations include determination of hepatitis B surface antigen (HBsAg), hepatitis B surface antibody (HBsAb) and hepatitis C antibody (anti-HCV).

Urinalysis evaluations include determination of color, appearance, pH, glucose, ketones, urobilinogen, nitrite, occult blood, protein, leukocyte esterase, microscopic and macroscopic evaluation, specific gravity.

Screen for drugs of abuse includes urine screen with respect to opiates, amphetamines, cannabinoids, benzodiazepines, cocaine, cotinine, barbiturates, phencyclidine, methadone and propoxyphene and alcohol tests, such as blood alcohol and breathalyzer test.

Further tests for females only include serum pregnancy test, urine pregnancy test and serum follicle stimulating hormone (FSH) test (for self reported postmenopausal females only).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will now be more fully described with reference to the accompanying examples. It should be understood, however, that the following description is illustrative only and should not be taken in any way as a restriction of the invention.

Example 1

In Example 1 a 200 mg tablet including 10 mg of oxycodone HCl was prepared using high molecular weight polyethylene oxide in combination with hydroxypropyl cellulose.

Composition:

Ingredient mg/unit % Oxycodone HCl 10 5 Polyethylene Oxide 160 80 (MW: approximately 4,000,000; Polyox ™ WSR- 301) Hydroxypropyl 30 15 Cellulose (Klucel ™ HXF) Total 200 100

Process of Manufacture:

The processing steps to manufacture tablets were as follows:

-   1. Oxycodone HCl, Polyethylene Oxide and hydroxypropyl cellulose was     dry mixed in a low/high shear Black & Decker Handy Chopper dual     blade mixer with a 1.5 cup capacity. -   2. Step 1 blend was compressed to target weight on a single station     tablet Manesty Type F 3 press -   3. Step 2 tablets were spread onto a tray and placed in a Hotpack     model 435304 oven at 70° C. for approximately 14.5 hours to cure the     tablets.

In vitro testing including testing tamper resistance (hammer and breaking strength test) and resistance to alcohol extraction was performed as follows.

The tablets were tested in vitro using USP Apparatus 2 (paddle) at 50 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20, UV at 230 nM. The results are presented in Table 1.1.

Uncured tablets, cured tablets and tampered, i.e. flattened, cured tablets were tested. The cured tablets were flattened with a hammer using 7 manually conducted hammer strikes to impart physical tampering. The tablet dimensions before and after the flattening and the dissolution profiles were evaluated on separate samples. The results are presented in Table 1.1.

As a further tamper resistance test, the cured tablets were subjected to a breaking strength test applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking. The results are also presented in Table 1.1.

In addition, cured tablets were tested in vitro using ethanol/SGF media at ethanol concentrations of 0%, 20% and 40% to evaluate alcohol extractability. Testing was performed using USP Apparatus 2 (paddle) at 50 rpm in 500 ml of media at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20, UV at 220 nM. Sample time points include 0.5 and 1 hour. The results are also presented in Table 1.2.

TABLE 1.1 Cured Flattened Uncured by 7 hammer whole Whole strikes Tablet Thickness    4.52 ¹    4.39 ¹    2.23 ² Dimensions (mm) Diameter (mm) —    7.56 ¹    10.27 ² Breaking —  196+ ³ — strength (N) Diameter (mm) —    7.33 ¹ — post breaking strength test Dissolution 0.5 hr   13 34 33 (% Released) 1 hr 18 46 45 (n = 3 tabs 2 hr 28 63 62 per vessel) 4 hr 43 81 83 8 hr 65 86 87 17 hr  85 86 87 ¹ n = median of 3 measurements ² n = median of 5 measurements ³ 196+ means that subjected to the maximum force of 196 Newton the tablets did not break, n = median of 3 measurements

TABLE 1.2 Dissolution (% Released) (n = 2 tabs per vessel) 0% Ethanol 20% Ethanol 40% Ethanol Concentration in Concentration in Concentration in SGF SGF SGF Time uncured cured uncured cured uncured cured 0.5 13 37 13 32 11 33 1 22 50 21 46 22 43

Example 2

In Example 2 three different 100 mg tablets including 10 and 20 mg of Oxycodone HCl were prepared using high molecular weight polyethylene oxide and optionally hydroxypropyl cellulose.

Compositions:

Example 2.1 Example 2.2 Example 2.3 Ingredient mg/unit mg/unit mg/unit Oxycodone HCl 10 20 10 Polyethylene Oxide 90 80 85 (MW: approximately 4,000,000; Polyox ™ WSR301) Hydroxypropyl 0 0 5 Cellulose (Klucel ™ HXF) Total 100 100 100

Process of Manufacture:

The processing steps to manufacture tablets were as follows:

-   1. Oxycodone HCl, Polyethylene Oxide and Hydroxypropyl Cellulose     were dry mixed in a low/high shear Black & Decker Handy Chopper dual     blade mixer with a 1.5 cup capacity. -   2. Step 1 blend was compressed to target weight on a single station     tablet Manesty Type F 3 press. -   3. Step 2 tablets were spread onto a tray placed in a Hotpack model     435304 oven at 70-75° C. for approximately 6 to 9 hours to cure the     tablets.

In vitro testing including testing for tamper resistance (bench press and breaking strength test) was performed as follows.

The cured tablets were tested in vitro using USP Apparatus 2 (paddle) at 50 rpm in 500 ml simulated gastric fluid without enzymes (SGF) at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20, UV at 220 nM. Cured tablets and cured flattened tablets were tested. The tablets were flattened using 2500 psi with a Carver style bench press to impart physical tampering. The results are presented in Table 2.

As a further tamper resistance test, the cured tablets were subjected to a breaking strength test applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking. The results are presented in Table 2.

TABLE 2 Example 2.1 Example 2.2 Example 2.3 Flattened Flattened Flattened by by by Whole bench Whole bench Whole bench (n = 6) press (n = 2) press (n = 5) press Tablet Thickness 3.36 0.58 3.14 0.84 3.48 0.49 Dimensions (mm) Diameter 6.48 12.80 6.58 13.44 6.46 12.86 (mm) Thickness — 17.3 — 26.8 — 14.0 (%) Breaking 196+¹ n/a 196+¹ n/a 196+¹ n/a strength (N) Dissolution 0.5 hr   34 46 42 50 40 56 (% 1 hr 50 62 57 71 55 72 Released) 2 hr 72 78 78 91 77 89 (n = 1) 4 hr 81 82 95 93 93 100 8 hr 82 82 95 93 94 100 12 hr  83 82 96 94 95 101 ¹196+ means that subjected to the maximum force of 196 Newton the tablets did not break

Example 3

In Example 3 a 200 mg tablet prepared including 10 mg oxycodone HCl and high molecular weight polyethylene oxide were prepared.

Composition:

Ingredient mg/unit % Oxycodone HCl 10 5 Polyethylene Oxide 188 94 (MW: approximately 4,000,000; Polyox ™ WSR301) Magnesium Stearate 2 1 Total 200 100

Process of Manufacture:

The processing steps to manufacture tablets were as follows:

-   1. Oxycodone HCl, Polyethylene Oxide and Magnesium Stearate were dry     mixed in a low/high shear Black & Decker Handy Chopper dual blade     mixer with a 1.5 cup capacity. -   2. Step 1 blend was compressed to target weight on a single station     tablet Manesty Type F 3 press. -   3. Step 2 tablets were placed onto a tray placed in a Hotpack model     435304 oven at 70° C. for 1 to 14 hours to cure the tablets.

In vitro testing including testing for tamper resistance (breaking strength test) was performed as follows:

The tablets were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20 USP Apparatus, UV at 220 nM, after having been subjected to curing for 2, 3, 4, 8, and 14 hours. Tablet dimensions of the uncured and cured tablets and dissolution results are presented in Table 3.

As a further tamper resistance test, the cured and uncured tablets were subjected to a breaking strength test applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking. The results are presented in Table 3.

TABLE 3 Un- Cure Time (hours) Cured² 1¹ 2¹ 4¹ 8¹ 14² Tablet Weight 208 208 209 209 208 210 Dimensions (mg) Thickness 4.74 5.17 5.25 5.17 5.17 4.85 (mm) Diameter 7.93 7.85 7.80 7.75 7.69 7.64 (mm) Breaking 176 196+³ 196+³ 196+³ 196+³ 196+³ strength (N) Dissolution 0.5 hr   Not Not 16 11 15 33 (% 1 hr tested tested 23 18 23 50 Released) 2 hr 34 28 36 69 (n = 2) 4 hr 54 45 58 87 8 hr 81 69 83 93 12 hr  96 83 92 94 ¹Tablet dimensions n = 4 ²Tablet dimensions n = 10 ³196+ means that subjected to the maximum force of 196 Newton the tablets did not break

Example 4

In Example 4 six different 100 mg tablets (Examples 4.1 to 4.6) including 10 mg of oxycodone HCl are prepared varying the amount and molecular weight of the used polyethylene oxides.

Compositions:

4.1 4.2 4.3 4.4 4.5 4.6 mg/ mg/ mg/ mg/ mg/ mg/ Ingredient unit unit unit unit unit unit Oxycodone HCl 10 10 10 10 10 10 Polyethylene Oxide 89.5 79.5 69.5 89.0 0 0 (MW: approximately 4,000,000; Polyox ™ WSR 301) Polyethylene Oxide 0 10 20 0 0 0 (MW; approximately 100,000; Polyox ™ N10) Polyethylene Oxide 0 0 0 0 0 89.5 (MW: approximately 2,000,000; Polyox ™N-60K) Polyethylene Oxide 0 0 0 0 89.5 0 MW; approximately 7,000,000; Polyox ™ WSR 303) Butylated 0 0 0 0.5 0 0 Hydroxytoluene (BHT) Magnesium Stearate 0.5 0.5 0.5 0.5 0.5 0.5 Total 100 100 100 100 100 100 Blend size (g) 125 125 125 125 157.5 155.5 Total Batch size (g) 250 250 250 250 157.5 155.5 (amount manufactured) The processing steps to manufacture tablets were as follows:

-   1. Oxycodone HCl and Polyethylene Oxide (and BHT if required) were     dry mixed for 30 seconds in a low/high shear Black & Decker Handy     Chopper dual blade mixer -   2. Magnesium stearate was added to Step 1 blend and mixed for an     additional 30 seconds. -   3. Step 2 blend was compressed to target weight on a single station     tablet Manesty Type F 3 press using standard round (0.2656 inch)     concave tooling -   4. Step 3 tablets were loaded into a 15 inch coating pan (LCDS     Vector

Laboratory Development Coating System) at 38 rpm equipped with one baffle. A temperature probe (wire thermocouple) was placed inside the coating pan near the bed of tablets to monitor the bed temperature. The tablet bed was heated to a temperature of about 70-about 80° C. (the temperature can be derived from Tables 4.1 to 4.6 for each Example) for a minimum of 30 minutes and a maximum of 2 hours. The tablet bed was then cooled and discharged.

In vitro testing including testing for tamper resistance (breaking strength and hammer test) was performed as follows:

Uncured and tablets cured at 0.5, 1, 1.5 and 2 hours of curing were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20, UV wavelength at 220 nM. Tablet dimensions and dissolution results corresponding to the respective curing time and temperature are presented in Tables 4.1 to 4.6.

As a further tamper resistance test, the cured and uncured tablets were subjected to a breaking strength test applying a force of a maximum of 196

Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking. The results are provided in Tables 4.1 to 4.6.

Additionally, the tablets were flattened with a hammer using 10 manually conducted hammer strikes to impart physical tampering (hammer test).

TABLE 4.1 Example 4.1 Uncured Cure Time (hours) (n = 5) (n = 10) 0.5 1.0 1.5 2.0 Tablet Weight (mg) 108 109 108 107 107 Dimensions Thickness (mm) 3.64 3.93 3.94 3.90 3.83 Diameter (mm) 6.74 6.62 6.57 6.55 6.52 Breaking strength 94 196+² 196+² 196+² 196+² (N) Diameter (mm) mashed¹ 5.15 5.38 5.23 5.44 post breaking strength test (measured directly after the test) Curing 0 min 19.7 — — — Process 10 min — 66.2 — — — Tablet Bed 20 min — 68.6 — — — Temp ° C. 30 min — 73.5 — — — (temperature 40 min — — 76.9 — — probe 60 min — — 78.9 — — within the 90 min — — — 79.8 — pan) 120 min — — — — 80.2 n = 3 3 2 2 2 Dissolution 0.5 hr 19 21 18 18 19 (% 1 hr 30 32 30 29 31 Released) 2 hr 47 49 46 46 50 4 hr 71 76 70 69 75 8 hr 93 96 91 89 93 12 hr 99 99 96 93 96 n = 1 1 1 Post Hammer Test³ (10 strikes n/a 1.70 2.18 2.37 2.09 applied manually) 2.31 2.06 2.26 Thickness (mm) 2.39 2.66 2.28 ¹Tablets mashed and crumbled during the breaking strength test ²196+ means that subjected to the maximum force of 196 Newton the tablets did not break ³Applied 10 hammer strikes, the tablets flattened but did not break apart, hammering imparted some edge splits.

TABLE 4.2 Example 4.2 Uncured Cure Time (hours) (n = 5) (n = 10) 0.5 1.0 1.5 2.0 Tablet Weight (mg) 108 109    109    109    107    Dimensions Thickness (mm) 3.65 3.90 3.92 3.87 3.74 Diameter (mm) 6.74 6.61 6.54 6.52 6.46 Breaking strength (N) 93 196+ ³  196+ ³  196+ ³  196+ ³  Diameter (mm) mashed ² 5.40 5.37 5.36 5.61 post breaking strength test (measured directly after the test) Relaxed diameter (mm) — 5.60 5.52 5.48 5.73 post breaking strength test (NLT 15 min relax period) Curing 0 min 20.2  — — — Process 10 min — 71.6  — — — Tablet Bed 20 min — 74.9  — — — Temp ° C. 30 min — 76.1  — — — (temperature 40 min — — 79.8  — — probe within 60 min — — 80.2  — — the pan) 90 min — — — 76.4  — 120 min — — — — 77.5  Dissolution 0.5 hr — 20    20    — 29    (% Released) 1 hr — 30    31    — 44    (n = 3) 2 hr — 47    47    — 66    4 hr — 70    70    — 90    8 hr — 89    91    — 95    12 hr — 92    94    — 94    n = 1   1   1   1   Post Hammer Test (10 strikes n/a 1.98 2.00 1.80 1.62 applied manually) 1.96 1.76 2.06 1.95 Thickness (mm) 1.99 1.79 1.98 1.53 ² Tablets mashed and crumbled during the breaking strength test ³ 196+ means that subjected to the maximum force of 196 Newton the tablets did not break.

TABLE 4.3 Example 4.3 Uncured Cure Time (hours) (n = 5) (n = 10) 0.5 1.0 1.5 2.0 Tablet Weight (mg) 108 107    108    108    107    Dimensions Thickness (mm) 3.63 3.85 3.82 3.78 3.72 Diameter (mm) 6.74 6.61 6.55 6.48 6.46 Breaking strength (N) 91 196+ ³  196+ ³  196+ ³  196+ ³  Diameter (mm) mashed ² 5.58 5.60 5.56 5.72 post breaking strength test (measured directly after the test) Relaxed diameter (mm) — 5.77 5.75 5.68 5.82 post breaking strength test (NLT 15 min relax period) Curing 0 min 20.3  — — — Process 10 min — 71.0  — — — Tablet Bed 20 min — 74.1  — — — Temp ° C. 30 min — 75.9  — — — (temperature 40 min — — 76.5  — — probe within 60 min — — 77.8  — — the pan 90 min — — — 76.0  — within the 120 min — — — — 80.2  pan) n = 3   3   2   Dissolution 0.5 hr — 22    23    — 33    (% Released) 1 hr — 32    35    — 52    2 hr — 49    54    — 76    4 hr — 70    80    — 93    8 hr — 94    95    — 96    12 hr — 96    96    — 96    n = 1   1   1   1   Post Hammer Test (10 strikes n/a 2.16 1.95 1.43 1.53 applied manually) 1.96 1.85 1.67 1.66 Thickness (mm) 1.91 2.03 1.65 2.08 ² Tablets mashed and crumbled during the breaking strength test ³ 196+ means that subjected to the maximum force of 196 Newton the tablets did not break.

TABLE 4.4 Example 4.4 Uncured Cure Time (hours) (n = 5) (n = 10) 0.5 1.0 1.5 2.0 Tablet Weight (mg) 101 101    101    101    101    Dimensions Thickness (mm) 3.49 3.75 3.71 3.69 3.70 Diameter (mm) 6.75 6.59 6.55 6.55 6.52 Breaking strength (N) 81 196+ ³  196+ ³  196+ ³  196+ ³  Diameter (mm) mashed ² 5.39 5.39 5.39 5.47 post breaking strength test (measured directly after the test Relaxed diameter (mm) — 5.58 5.59 5.58 5.63 post breaking strength test (NLT 15 min relax period) Curing 0 min 37.3  Process 5 min — 67.0  — — — Tablet Bed 10 min — 71.8  — — — Temp ° C. 20 min — 74.6  — — — (temperature 30 min — 76.2  — — — probe within 40 min — — 77.0  — — the pan) 60 min — — 78.7  — — 90 min — — — 80.3  — 120 min — — — — 79.3  Dissolution 0.5 hr — 17    16    — — (% Released) 1 hr — 26    25    — — (n = 3) 2 hr — 41    40    — — 4 hr — 63    59    — — 8 hr — 79    75    — — 12 hr — 82    80    — — n = 1   1   1   1   Post Hammer Test (10 strikes — 2.11 2.42 2.14 2.18 applied manually) 2.29 2.25 2.28 2.09 Thickness (mm) 2.32 2.13 2.07 2.36 ² Tablets mashed and crumbled during the breaking strength test. ³ 196+ means that subjected to the maximum force of 196 Newton the tablets did not break.

TABLE 4.5 Example 4.5 Uncured Cure Time (hours) (n = 5) (n = 10) 0.5 1.0 1.5 2.0 Tablet Weight (mg) 108 108    107    107    107    Dimensions Thickness (mm) 3.61 3.87 3.84 3.84 3.84 Diameter (mm) 6.74 6.69 6.63 6.61 6.59 Breaking strength (N) 116 196+ ³  196+ ³  196+ ³  196+ ³  Diameter (mm) mashed ² 5.49 5.59 5.51 5.54 post breaking strength test(measured directly after the test Diameter (mm) post — 5.67 5.76 5.67 5.68 breaking strength test (NLT 15 min relax period) Curing 0 min 19.8  Process 5 min — 56.8  — — — Tablet Bed 10 min — 70.0  — — — Temp ° C. 20 min — 74.6  — — — (temperature 30 min — 76.2  — — — probe within 40 min — — 77.0  — — the pan) 60 min — — 78.2  — — 90 min — — — 80.2  — 120 min — — — — 80.3  Dissolution 0.5 hr — 21    20    — — (% Released) 1 hr — 33    32    — — (n = 3) 2 hr — 51    51    — — 4 hr — 75    76    — — 8 hr — 96    96    — — 12 hr — 100    100    — — n = 1   1   1   1   Post Hammer Test (10 strikes — 2.19 2.31 2.36 2.45 applied manually) 2.15 2.48 2.42 2.08 Thickness (mm) 2.10 2.28 2.19 2.28 ² Tablets mashed and crumbled during the breaking strength test ³ 196+ means that subjected to the maximum force of 196 Newton the tablets did not break.

TABLE 4.6 Example 4.6 Cure Time (n = 5) Un-Cured 10 20 0.5 1.0 1.5 2.0 (n = 6) min min hr hr hr hr Tablet Weight (mg) 110 108 108 109 108 109 109 Dimensions Thickness 3.65 3.93 3.89 3.89 3.87 3.85 3.85 (mm) Diameter 6.73 6.71 6.63 6.61 6.57 6.55 6.53 (mm) Breaking 128 196+ ² strength (N) Diameter mashed ¹ 5.27 5.47 5.51 5.51 5.56 5.63 (mm) post breaking strength test (measured directly after the test Diameter — 5.48 5.60 5.67 5.66 5.69 5.76 (mm) post breaking strength test (NLT 15 min relax period) Curing 0 min 30.8 Process 5 min — 70.5 — — — — — Tablet Bed 10 min — 79.5 — — — — — Temp ° C 20 min — — 79.9 — — — — (temperature 30 min — — — 79.6 — — — probe within 40 min — — — — 80.0 — — the pan) 60 min — — — — 79.8 — — 90 min — — — — — 80.2 — 120 min — — — — — — 80.4 Dissolution 0.5 hr — — — 19 20 — — (% Released) 1 hr — — — 30 30 — — (n = 3) 2 hr — — — 48 51 — — 4 hr — — — 73 78 — — 8 hr — — — 99 99 — — 12 hr — — — 99 102 — — n = 1 1 1 1 1 1 Post Hammer Test ³ — 1.46 2.18 2.45 2.23 2.38 2.42 (10 strikes 1.19 2.20 2.34 2.39 2.26 2.40 applied manually) 1.24 2.18 2.03 2.52 2.50 2.16 Thickness (mm) ¹ Tablets mashed and crumbled during the breaking strength test ² 196+ means that subjected to the maximum force of 196 Newton the tablets did not break. ³ The tablets flattened but did not break apart, hammering imparted some edge splits.

Example 5

In Example 5 three further tablets including 10% (by wt) of oxycodone HCl were prepared.

Compositions:

Example 5.1 Example 5.2 Example 5.3 mg/unit mg/unit mg/unit Tablet (%) (%) (%) Oxycodone HCl  12 (10)  20 (10)  12 (10) Polyethylene Oxide 106.8 (89)  178 (89) 82.8 (69) (MW: approximately 4,000,000; Polyox ™ WSR 301) Polyethylene Oxide  0  0  24 (20) (lMW; approximately 100,000; Polyox ™ N10) Magnesium Stearate 1.2 (1) 2.0 (1)  1.2 (1) Total 120 200 120 Total Batch size (kg) 100 100 100 (amount manufactured) Coating mg/unit mg/unit mg/unit Opadry white film 3.6 (3) 6.0 (3) 3. (3) coating concentrate formula Y-5-18024-A The processing steps to manufacture tablets were as follows:

-   1. The polyethylene oxide was passed through a Sweco Sifter equipped     with a 20 mesh screen, into separate suitable containers. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride\     -   Polyethylene oxide N10 (only Example 5.3)     -   Remaining polyethylene oxide WSR 301 -   3. Step 2 materials were blended for 10 minutes (Example 5.1) or 20     minutes (Example 5.2) and 15 minutes (Example 5.3) with the I bar     on. -   4. Magnesium stearate was charged into the Gemco “V” blender. -   5. Step 4 materials were blended for 3 minutes with the I bar off. -   6. Step 5 blend was charged into clean, tared, stainless steel     containers. -   7. Step 5 blend was compressed to target weight on a 40 station     tablet press at 135,000 tph speed using 9/32 standard round, concave     (plain) tooling. -   8. Step 7 tablets were loaded into a 48 inch Accela-Coat coating pan     at 7 rpm at a pan load of 98.6 kg (Example 5.1), 92.2 kg (Example     5.2) and 96.9 kg (Example 5.3) and the tablet bed was heated using     an exhaust air temperature to achieve approximately 80° C. (Example     5.2 and 5.3) and 75° C. (Example 5.1) inlet temperature and cured     for 1 hour at the target inlet temperature. -   9. The pan speed was continued at 7 to 10 rpm and the tablet bed was     cooled using an exhaust air temperature to achieve a 25° C. inlet     temperature until the bed temperature achieves 30-34° C. -   10. The tablet bed was warmed using an exhaust air temperature to     achieve a 55° C. inlet temperature. The film coating was started     once the outlet temperature approached 39° C. and continued until     the target weight gain of 3% was achieved. -   11. After coating was completed, the pan speed was set to 1.5 rpm     and the exhaust temperature was set to 27° C., the airflow was     maintained at the current setting and the system cooled to an     exhaust temperature of 27-30° C. -   12. The tablets were discharged.

In vitro testing including testing for tamper resistance (breaking strength and hammer test) and resistance to alcohol extraction were performed as follows:

Tablets cured at 0.5 hours and tablets cured at 1.0 hour and coated were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using an Agilent UV/VIS Spectrometer Model HP8453, UV wavelength at 220 nM. Tablet dimensions and dissolution results corresponding to the respective curing time and temperature are presented in Tables 5.1 to 5.3.

Tablets cured at 1.0 hour and coated were tested in vitro using ethanol/SGF media at a concentration of 40% ethanol to evaluate alcohol extractability. Testing was performed using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using an Agilent UV/VIS Spectrometer Model HP8453, UV wavelength at 230 nM. Tablet dissolution results are presented in Table 5.3.

As a further tamper resistance test, the uncured tablets and cured tablets were subjected to a breaking strength test applying a force of a maximum of 439 Newton using a Schleuniger Model 6D apparatus to evaluate the resistance to breaking. The results are provided in Tables 5.1 to 5.3.

Additionally, the tablets were flattened with a hammer using 10 manually conducted hammer strikes to impart physical tampering (hammer test).

TABLE 5.1 Example 5.1 1 hr cure/ 30 min cure coated Uncured (n = 10) (n = 10) Tablet Weight (mg) 119.7 ¹ 120  122   Dimensions Thickness (mm)   3.63 ²    3.91  3.88 Diameter (mm) —    7.03  7.02 Breaking 54 ³   439 ⁴ 438 ⁴  strength (N) diameter (mm) —    4.18  4.26 post breaking strength Curing 10 min —   75.8 75.8 Process 20 min —   75.1 75.1 Inlet 30 min —   76.0 76.0 Temp ° C. 40 min — — 74.5 50 min — — 73.5 60 min — — 75.6 Dissolution 0.5 hr — 19 19   (% Released) 1 hr — 31 33   (n = 3) 2 hr — 47 50   4 hr — 71 76   8 hr — 93 97   12 hr — 99 102   pre post pre post Hammer Test — 3.90 1.77 3.87 2.09 (10 strikes applied manually) Tablet thickness measured (mm) pre and post test (n = 3) ¹ Fourteen in-process samples taken (40 tablets per each sample) and each sample averaged. The reported value is the average of the averages. ² n = 39 ³ n = 130 ⁴ n = 10; The tablets did not break when subjected to a maximum force of 438 N/439 N.

TABLE 5.2 Example 5.2 1 hr cure/ 30 min cure coated Uncured (n = 10) (n = 10) Tablet Weight (mg) 200.4 ¹ 201  206   Dimensions Thickness (mm)   5.50 ²    5.92  5.86 Diameter (mm) —    7.03  7.01 Breaking 85 ³   439 ⁴ 439 ⁴  strength (N) diameter (mm) —    5.52  5.72 post breaking strength Curing 10 min —   79.7 79.7 Process 20 min —   80.3 80.3 Inlet 30 min —   79.3 79.3 Temp ° C 40 min — — 79.5 50 min — — 80.9 60 min — — 81.0 Dissolution 0.5 hr — 14 15   (% Released) 1 hr — 23 24   (n = 3) 2 hr — 36 38   4 hr — 57 60   8 hr — 83 85   12 hr — 94 95   pre post pre post Hammer Test — 5.92 2.97 5.91 2.84 (10 strikes applied manually) Tablet thickness measured (mm) pre and post test (n = 3) ¹ Nine in-process samples taken (40 tablets per each sample) and each sample averaged. The reported value is the average of the averages. ² n = 27 ³ n = 90 ⁴ n = 10; The tablets did not break when subjected to a maximum force of 438 N/439 N.

TABLE 5.3 Example 5.3 1 hr cure/ 30 min cure coated Uncured (n = 10) (n = 10) Tablet Weight (mg) 120.5 ¹ 122  125   Dimensions Thickness (mm)   3.64 ²    3.85  3.77 Diameter (mm) —    7.03  7.01 Breaking 56 ³   438 ⁴ 439 ⁴  strength (N) diameter (mm) —    3.96  4.28 post breaking strength Curing 10 min —   80.0 80.0 Process 20 min —   82.3 82.3 Inlet 30 min —   78.9 78.9 Temp ° C 40 min — — 79.5 50 min — — 79.5 60 min — — 80.7 SGF SGF 40% EtOH Dissolution 0.5 hr — 20 23 21 (% Released) 1 hr — 31 37 31 (n = 3) 2 hr — 50 58 50 4 hr — 76 86 76 8 hr — 95 100 99 12 hr — 98 100 104 pre post pre post Hammer Test — 3.81 1.63 3.79 1.62 (10 strikes applied manually) Tablet thickness measured (mm) pre and post test (n = 3) ¹ Twelve in-process samples taken (40 tablets per each sample) and each sample averaged. The reported value is the average of the averages. ² n = 33 ³ n = 130 ⁴ n = 10; The tablets did not break when subjected to a maximum force of 438 N/439 N.

Example 6

In Example 6 tablets comprising Naltrexone HCl were prepared.

Compositions:

mg/unit Tablet Naltrexone HCl 10 Polyethylene Oxide 89.0 (MW: approximately 4,000,000; Polyox ™ WSR 301) Magnesium Stearate 1.0 Total 100 Total Batch size (kg) 20 (amount manufactured) Coating Base coat 3.0 Opadry Red film coating concentration formula Y-5-1-15139 Special effects 3.0 overcoat Opadry FX - Silver formula 62W28547

The tablets were prepared as outlined in Example 5, wherein a Gemco “V” blender (with 1 bar)—2 cu.ft, a 8 station rotary tablet press set at 24,000 tph speed with a 9/32 standard round concave (embossed upper/plain lower) tooling and a 24 inch Compu-Lab coater were used. The blending time in step 2 was 8 minutes, the pan load was 9.2 kg and the curing time 2 hours.

Example 7

Three further examples comprising each 10 mg of oxycodone hydrochloride were manufactured and tested.

Compositions:

Example 7.1 Example 7.2 Example 7.3 mg/unit mg/unit mg/unit Tablet (%) (%) (%) Oxycodone HCl 10 (5)   10 (6.67) 10 (10) Polyethylene Oxide 188 (94) 138.5 (92.3) 69 (69) (MW: approximately 4,000,000; Polyox ™ WSR 301) Polyethylene Oxide  0  0 20 (20) (MW; approximately 100,000; Polyox ™ N10) Magnesium Stearate  2 (1) 1.5 (1)  1 (1) Total 200 150 100 Total Batch size (kg) 100 100 100 (amount manufactured) Film Coating mg/unit mg/unit mg/unit Opadry white film coating 6 4.5 3 concentrate formula Y-5-18024-A The processing steps to manufacture tablets were as follows:

-   1. The magnesium stearate was passed through a Sweco Sifter equipped     with a 20 mesh screen, into separate suitable containers. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately ½ of the polyethylene oxide WSR 301 Oxycodone         hydrochloride     -   Polyethylene oxide N10 (only Example 7.3)     -   Remaining polyethylene oxide WSR 301 -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. Magnesium stearate was charged into the Gemco “V” blender. -   5. Step 4 materials were blended for 3 minutes with the I bar off. -   6. Step 5 blend was charged into clean, tared, stainless steel     containers. -   7. Step 5 blend was compressed to target weight on a 40 station     tablet press at 135,000 tph speed using 9/32 inch standard round,     concave (plain) tooling (Example 7.1 and 7.2) and using ¼ inch     standard round, concave (plain) tooling (Example 7.3). -   8. Step 7 tablets were loaded into a 48 inch Accela-Coat coating pan     at a load of 97.388 kg (Example 7.1), 91.051 kg (Example 7.2) and     89.527 kg (Example 7.3). -   9. The pan speed was set to 7 rpm and the tablet bed was heated by     setting the exhaust air temperature to achieve an inlet temperature     of approximately 75° C. The tablets were cured at the target inlet     temperature for 1 hour (Example 7.1 and 7.2) and for 30 minutes     (Example 7.3). -   10. The pan speed was continued at 6 to 8 rpm and the tablet bed was     cooled using an exhaust air temperature to achieve a 25° C. inlet     temperature until the exhaust temperature achieves 30-34° C. -   11. The tablet bed was warmed using an exhaust air temperature to     target a 55° C. inlet temperature. The film coating was started once     the outlet temperature approached 39° C. and continued until the     target weight gain of 3% was achieved. -   12. After coating was completed, the pan speed was set to 1.5 rpm     and the exhaust temperature was set to 27° C., the airflow was     maintained at the current setting and the system cooled to an     exhaust temperature of 27-30° C. -   13. The tablets were discharged.

In vitro testing including testing for tamper resistance (breaking strength, hammer test and flattened tablets) and resistance to alcohol extraction, as well as stability tests were performed as follows:

Cured, coated tablets (whole and flattened) were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×150 mm, 3 μm column, using a mobile phase consisting of a mixture of acetonitrile and non basic potassium phosphate buffer (pH 3.0) at 230 nm UV detection. Sample time points include 0.5, 0.75, 1.0, 1.5 and 2.0 hours. Additionally sample time points include 1.0, 4.0 and 12 hours.

Cured, coated tablets (whole and flattened) were tested in vitro using ethanol/SGF media at concentrations of 0% and 40% to evaluate alcohol extractability. Testing was performed using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×150 mm, 3 μm column, using a mobile phase consisting of a mixture of acetonitrile and non basic potassium phosphate buffer (pH 3.0) at 230 nm UV detection. Sample time points include 0.5, 0.75, 1.0, 1.5 and 2.0 hours.

Cured tablets were subjected to a breaking strength test by applying a force of a maximum of 439 Newton using a Schleuniger Model 6D apparatus to evaluate tablet resistance to breaking.

Cured tablets were subject to a high amount of pressure using a Carver manual bench press (hydraulic unit model #3912) to impart physical tampering by flattening the tablets.

Cured tablets were subjected to a further breaking strength test by the manual application of 10 hammer strikes to impart physical tampering.

Cured, coated tablets were subjected to a stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently testing the tablets in vitro as described above. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage, sample time points regarding dissolution test include 1.0, 4.0 and 12.0 hours.

Cured, coated tablets were subjected to a further stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently subjecting the tablets to the assay test to determine the content of oxycodone HCl in the tablet samples, in percent relative to the label claim. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage. In the assay test, oxycodone hydrochloride was extracted from two sets of ten tablets each with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

Cured, coated tablets were subjected to a further stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently subjecting the tablets to the oxycodone-N-oxide (ONO) test to determine the content of the degradation product oxycodone-N-oxide in percent relative to the oxycodone HCl label claim. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage. In the ONO test, oxycodone hydrochloride and its degradation products were extracted from a set of ten tablets with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 206 nm.

The results are presented in Tables 7.1 to 7.3

TABLE 7.1.1 Example 7.1 Flattened (n = 3) Whole (n = 10) (15,000 lbs applied) Tablet Weight (mg) 205    207  204  Dimensions Thickness (mm) 5.95    1.01¹    0.96¹ % Thickness   17.0   16.1 Diameter (mm) 7.02   17.13 ²   17.35 ² Breaking strength (N) ≧438³     Diameter (mm) 5.84 post Breaking strength pre post Hammer Test 6.04 2.96 pre and post 5.95 3.10 tablet thickness measured (mm) 6.03 3.32 Whole Whole Flattened Flattened SGF 40% EtOH SGF 40% EtOH Dissolution 0.5 hr 11 9 17 13 (% 0.75 hr  15 12 23 18 Released) 1.0 hr 20 16 28 21 (n = 3) 1.5 hr 27 21 36 29 2.0 hr 34 27 44 35 Whole Dissolution 0.5 hr — (%   1 hr 22 Released)   2 hr — (n = 6)   4 hr 57   8 hr —  12 hr 97 ¹3 measurements per tablet ² 2 measurements per tablet ³tablets did not break when subjected to the maximum force of 438 Newton

TABLE 7.1.2 Stability tests Example 7.1 Storage conditions (° C./% RH) and storage time¹ 1 Mo 2 Mo 3 Mo 3 Mo Initial 40/75 40/75 25/60 40/75 Dissolution (% 1 hr 22 21 21 20 21 Released) 4 hr 57 57 58 56 58 (n = 6) 12 hr  97 98 98 97 97 SGF Assay test Assay 1 96.6 96.2 97.3 97.1 95.0 (% oxycodone Assay 2 95.3 97.2 95.7 98.7 96.0 HCl)² Average 96.0 96.7 96.5 97.9 95.5 ONO test 0.02 0.06 0.06 0.04 0.05 (% oxycodone N-oxide)² ¹[Mo = month(s)]; ²relative to the label claim of oxycodone HCl.

TABLE 7.2.1 Example 7.2 Flattened (n = 3) Whole (n = 10) (20,000 lbs applied) Tablet Weight (mg) 154    154  153  Dimensions Thickness (mm) 4.68    0.75¹    0.77¹ % Thickness   16.0   16.5 Diameter (mm) 7.02   17.14 ²   16.90 ² Breaking strength (N) 438³   Diameter (mm) 4.93 post Breaking strength pre post Hammer Test 4.73 2.65 pre and post 4.64 2.95 tablet thickness measured (mm) 4.67 2.60 Whole Whole Flattened Flattened SGF 40% EtOH SGF 40% EtOH Dissolution 0.5 hr 14 10 21 15 (% 0.75 hr  19 14 27 20 Released) 1.0 hr 24 17 33 26 (n = 3) 1.5 hr 33 23 44 36 2.0 hr 40 29 53 43 Whole Dissolution 0.5 hr — (%   1 hr 26 Released)   2 hr — (n = 6)   4 hr 67   8 hr —  12 hr 98 ¹3 measurements per tablet ² 2 measurements per tablet

TABLE 7.2.2 Stability tests Example 7.2 Storage conditions (° C./% RH) and storage time¹ 1 Mo 2 Mo 3 Mo 3 Mo 6 Mo 6 Mo Initial 40/75 40/75 25/60 40/75 25/60 40/75 Dissolution (% 1 hr 26 24 22 23 24 25 25 Released) 4 hr 67 66 61 65 64 64 69 (n = 6) 12 hr  98 101 97 98 99 99 97 SGF Assay test Assay 1 97.1 97.7 96.4 98.4 97.3 96.3 94.1 (% oxycodone Assay 2 96.6 96.6 96.2 98.0 96.9 96.3 94.2 HCl)² Average 96.9 97.1 96.3 98.2 97.1 96.3 94.2 ONO test 0.02 0.08 0.04 0.03 0.04 0.06 0.26 (% oxycodone N-oxide)² ¹[Mo = month(s)]; ²relative to the label claim of oxycodone HCl.

TABLE 7.3.1 Example 7.3 Flattened (n = 3) Whole (n = 10) (15,000 lbs applied) Tablet Weight (mg) 103    102  104  Dimensions Thickness (mm) 3.92    0.61¹    0.66¹ (15.6) (16.8) Diameter (mm) 6.25   15.36 ²   15.24 ² Breaking strength (N) 439³   Diameter (mm) post 3.80 Breaking strength Pre post Hammer Test 3.90 1.66 pre and post 3.89 1.97 tablet thickness measured (mm) 3.91 1.56 Whole Whole Flattened Flattened SGF 40% EtOH SGF 40% EtOH Dissolution 0.5 hr 19 15 26 19 (% 0.75 hr  25 20 34 25 Released) 1.0 hr 30 25 40 31 (n = 3) 1.5 hr 41 33 51 41 2.0 hr 50 41 60 50 Whole Dissolution 0.5 hr (%   1 hr 32 Released)   2 hr — (n = 6)   4 hr 83   8 hr —  12 hr 101  ¹3 measurements per tablet ² 2 measurements per tablet ³The tablets did not break when subjected to the maximum force of 439 Newton.

TABLE 7.3.2 Stability tests Example 7.3 Storage conditions (° C./% RH) and storage time¹ 1 Mo 2 Mo 3 Mo Initial 40/75 40/75 25/60 Dissolution (% 1 hr 32 29 30 31 Released) 4 hr 83 76 77 78 (n = 6) 12 hr  101 103 102 103 SGF Assay test Assay 1 99.4 99.4 97.3 101.0 (% oxycodone Assay 2 98.8 98.9 100.0 101.0 HCl)² Average 99.1 99.1 98.6 101.0 ONO test 0.05 0.01 0.01 0.02 (% oxycodone N-oxide) ¹[Mo = month(s)]; ²relative to the label claim of oxycodone HCl

Example 8

Two further 160 mg oxycodone hydrochloride tablets (Examples 8.1 and 8.2) were manufactured.

Compositions:

Example 8.1 Example 8.2 Ingredient mg/unit % mg/unit % Oxycodone 160 25 160 25 Hydrochloride Polyethylene Oxide 476.8 74.5 284.8 44.5 (high MW, grade 301) Polyethylene Oxide 0 0 192 30 (low MW, grade N10) Magnesium Stearate 3.2 0.5 3.2 0.5 Total 640 100 640 100 The processing steps to manufacture tablets were as follows:

-   1. Oxycodone HCl and Polyethylene Oxide were dry mixed in a low/high     shear Black & Decker Handy Chopper dual blade mixer with a 1.5 cup     capacity for 30 seconds. -   2. Magnesium Stearate was added and mixed with the step 1 blend for     additional 30 seconds -   3. Step 2 blend was compressed to target weight on a single station     tablet Manesty Type F 3 press using a capsule shaped tooling     (7.937×14.290 mm). -   4. Step 2 tablets were placed onto a tray placed in a Hotpack model     435304 oven at 73° C. for 3 hours to cure the tablets.

In vitro testing including testing for tamper resistance (breaking strength test) was performed as follows:

The tablets were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using an Agilent UV/VIS Spectrometer Model HP8453, UV wavelength at 280 nM, after having been subjected to curing for 3 hours. Tablet dimensions of the uncured and cured tablets and dissolution results are presented in Table 8.

As a further tamper resistance test, the cured and uncured tablets were subjected to a breaking strength test applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking. The results are presented in Table 8.

Additionally, the tablets were flattened with a hammer using 10 manually conducted hammer strikes to impart physical tampering (hammer test). Results are presented in Table 8.

TABLE 8 Example 8.1 Example 8.2 Uncured 3 hr cure Uncured 3 hr cure (n = 12) (n = 5) (n = 12) (n = 10) Tablet Weight (mg) 648    648  643    643  Dimensions Thickness (mm) 7.07    7.42 7.01    7.20 Width (mm) 7.96    7.97 7.96    7.91 Breaking 196+ ¹   196+ ¹ 196+ ¹   196+ ¹ strength(N) (n = 2) (n = 1) (n = 2) (n = 2) Dissolution 0.5 hr   Not tested  9 Not tested 13 (% Released) 1 hr 15 21 2 hr 23 35 4 hr 38 59 8 hr 60 89 12 hr  76 92 Post Hammer Test Readily — Readily    3.80 (10 strikes applied manually) broke apart broke apart Thickness (mm) ¹ The hardness tester would max at 20+ Kp equivalent to 196+ Newtons (1 Kp = 9.807 Newtons), the tablets did not break when subjected to the maximum force of 196 N.

Example 9

Three examples comprising each 12 mg of hydromorphone hydrochloride were manufactured and tested.

Compositions:

Example 9.1 Example 9.2 Example 9.3 mg/unit mg/unit mg/unit Tablet Hydromorphone HCl 12 12 12 Polyethylene Oxide 483 681 829.5 (MW: approximately 7,000,000; Polyox ™ WSR 303) Magnesium Stearate 5 7 8.5 Total 500 700 850 Total Batch size (kg) 100 100 100 (amount manufactured) Film Coating Magnesium Stearate 0.100 0.142 0.170 Opadry white film 15 21 25.5 coating concentrate formula Y-5-18024-A Coating Batch Size (kg) 80 79 80 The processing steps to manufacture tablets were as follows:

-   1. The Hydromorphone HCl and magnesium stearate were passed through     a Sweco Sifter equipped with a 20 mesh screen, into separate     suitable containers. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately 25 kg of the polyethylene oxide WSR 303         Hydromorphone hydrochloride     -   Approximately 25 kg of the polyethylene oxide WSR 303 -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. The remaining polyethylene oxide WSR 303 was charged into the     Gemco “V” blender. -   5. Step 4 materials were blended for 10 minutes with the I bar on. -   6. Magnesium stearate was charged into the Gemco “V” blender. -   7. Step 6 materials were blended for 3 minutes with the I bar off. -   8. Step 7 blend was charged into clean, tared, stainless steel     containers. -   9. Step 8 blend was compressed to target weight on a 40 station     tablet press at 133,000 tph speed using ½ inch standard round,     concave (plain) tooling. -   10. Step 9 tablets were loaded into a 48 inch Accela-Coat coating     pan at a load of 80 kg (Example 9.1 and 9.3) and 79 kg (Example     9.2). -   11. The pan speed was set to 2 rpm and the tablet bed was heated by     setting the exhaust air temperature to achieve a target inlet     temperature of approximately 75° C. The tablets were cured for 1     hour and 15 minutes at the following inlet temperature range,     75-87° C. (Example 9.1), 75-89° C. (Example 9.2) and 75-86° C.     (Example 9.3). -   12. At the onset of cooling the pan speed was increased to 7 rpm and     the tablet bed was cooled using an exhaust air temperature to     achieve a 25° C. inlet temperature until the exhaust temperature     achieves 30-34° C. During the cooling process, magnesium stearate     was added to the tablet bed to reduce tablet sticking. -   13. The tablet bed was warmed using an exhaust air temperature to     target a 55° C. inlet temperature. The film coating was started once     the outlet temperature approached 39° C. and continued until the     target weight gain of 3% was achieved. -   14. After coating was completed, the pan speed was set to 1.5 rpm     and the exhaust temperature was set to 27° C., the airflow was     maintained at the current setting and the system cooled to an     exhaust temperature of 27-30° C. -   15. The tablets were discharged.

Example 10

A further tablet comprising 12 mg of hydromorphone hydrochloride was prepared.

Composition:

Example 10 Tablet mg/unit Hydromorphone HCl 12 Polyethylene Oxide 483 (MW: approximately 7,000,000; Polyox ™ WSR 303) Magnesium Stearate 5 Total 500 Total Batch size (kg) 119.98 (amount manufactured) The processing steps to manufacture tablets were as follows:

-   1. The hydromorphone HCl and magnesium stearate were passed through     a Sweco Sifter equipped with a 20 mesh screen, into separate     suitable containers. -   2. A Gemco “V” blender (with 1 bar)—10 cu. ft. was charged in the     following order:     -   Approximately 60 kg of the polyethylene oxide WSR 303     -   Hydromorphone hydrochloride -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. The remaining polyethylene oxide WSR 303 was charged into the     Gemco “V” blender. -   5. Step 4 materials were blended for 10 minutes with the I bar on. -   6. Magnesium stearate was charged into the Gemco “V” blender. -   7. Step 6 materials were blended for 3 minutes with the I bar off. -   8. Step 7 blend was charged into clean, tared, stainless steel     containers. -   9. Step 8 blend was compressed to target weight on a 40 station     tablet press at 150,000 tph speed using ½ inch standard round,     concave (plain) tooling. -   10. Step 9 tablets were loaded into a 48 inch Accela-Coat coating     pan at a load of 92.887 kg. -   11. The pan speed was set to 1.9 rpm and the tablet bed was heated     by setting the exhaust air temperature to achieve a target inlet     temperature of approximately 80° C. The tablets were cured for 2     hours at the following inlet temperature range 80-85° C. -   12. At the end of curing and onset of cooling, the tablet bed began     to agglomerate (tablets sticking together). The pan speed was     increased up to 2.8 rpm, but the tablet bed fully agglomerated and     was non-recoverable for coating.

It is assumed that the agglomeration of tablets can be avoided, for example by lowering the curing temperature, by increasing the pan speed, by the use of Magnesium Stearate as anti-tacking agent, or by applying a sub-coating prior to curing.

However some tablets were sampled prior to cooling for In vitro testing which was performed as follows:

Cured tablets were tested in vitro using USP Apparatus 2 (paddle) at 75 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. using an on Waters Alliance System equipped with a Waters Novapak C₁₈ 3.9 mm×150 mm column, using a mobile phase consisting of a mixture of acetonitrile, SDS, and mono basic sodium phosphate buffer (pH 2.9). Detection was done with a PDA detector. Sample time points include 1, 2, 4, 8, 12, 18, and 22 hours.

TABLE 10 USP Apparatus 2 Dissolution 1 hr 19 (% Released) 2 hr 30 (n = 6) 4 hr 48 8 hr 77 12 hr  95 18 hr  103 22 hr  104

Example 11

A further tablet comprising 12 mg of hydromorphone hydrochloride was prepared.

Composition:

mg/unit Tablet Hydromorphone HCl 12 Polyethylene Oxide 681 (MW: approximately 7,000,000; Polyox ™ WSR 303) Magnesium Stearate 7 Total 700 Total Batch size (kg) 122.53 (amount manufactured) Film Coating Opadry white film coating concentrate 21 formula Y-5-18024-A Coating Batch Size (kg) 80

The processing steps to manufacture tablets were as follows:

-   1. The hydromorphone HCl and magnesium stearate were passed through     a Sweco Sifter equipped with a 20 mesh screen, into separate     suitable containers. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately 60 kg of the polyethylene oxide WSR 303     -   Hydromorphone hydrochloride -   3. The remaining polyethylene oxide WSR 303 was charged into the     Gemco “V” blender. -   4. Step 4 materials were blended for 10 minutes with the I bar on. -   5. Magnesium stearate was charged into the Gemco “V” blender. -   6. Step 5 materials were blended for 3 minutes with the I bar off. -   7. Step 6 blend was charged into clean, tared, stainless steel     containers. -   8. Step 7 blend was compressed to target weight on a 40 station     tablet press at 150,000 tph speed using ½ inch standard round,     concave (plain) tooling. -   9. Step 8 tablets were loaded into a 48 inch Accela-Coat coating pan     at a load of 80.000 kg. -   10. The pan speed was set to 1.8 rpm and the tablet bed was heated     by setting the exhaust air temperature to achieve a target inlet     temperature of approximately 80° C. The tablets were cured for 1.25     hours at the following inlet temperature range 75-85° C. -   11. At the end of curing and onset of cooling, the tablet bed began     to agglomerate (tablets sticking together). The pan speed was     increased up to 10 rpm, and the tablets separated. -   12. The pan speed was continued at approximately 10 rpm and the     tablet bed was cooled using an exhaust air temperature to achieve a     25° C. inlet temperature until the exhaust temperature achieves     30-34° C. -   13. The tablet bed was warmed using an exhaust air temperature to     target a 55° C. inlet temperature. The film coating was started once     the outlet temperature approached 39° C. and continued until the     target weight gain of 3% was achieved. -   14. After coating was completed, the pan speed was set to 1.5 rpm     and the exhaust temperature was set to 27° C., the airflow was     maintained at the current setting and the system cooled to an     exhaust temperature of 27-30° C. -   15. The tablets were discharged.     In vitro testing was performed as follows:

Coated tablets were tested in vitro using USP Apparatus 2 (paddle) at 75 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. using an a Waters Alliance System equipped with a Waters Novapak C₁₈ 3.9 mm×150 mm column, using a mobile phase consisting of a mixture of acetonitrile, SDS, and mono basic sodium phosphate buffer (pH 2.9). Detection was done with a PDA detector. Sample time points include 1, 2, 4, 8, 12, 18, 22, and 24 hours. The results are presented in Table 11.

TABLE 11 USP Apparatus 2 Dissolution  1 hr 12 (% Released)  2 hr 19 (Mean n = 6)  4 hr 29  8 hr 46 12 hr 60 18 hr 76 22 hr 84 24 hr 88

Example 12

Two further examples comprising 10 mg of oxycodone hydrochloride which include core tablets as presented in Example 2.3 were manufactured which were coated by a polyethylene oxide coating to provide a delay of the release.

Composition: Core Tablet

Ingredient mg/unit Oxycodone HCl 10 Polyethylene Oxide 85 (MW: approximately 4,000,000; Polyox ™ WSR301) Hydroxypropyl Cellulose 5 (Klucel ™ HXF) Total Tablet Core 100

Composition: Compression Coat Over Core Tablet

Example 12.1 Example 12.2 Ingredient mg/unit mg/unit Polyethylene Oxide 200 100 (MW: approximately 4,000,000; Polyox ™ WSR301) Core tablet 100 100 Total Tablet Weight 300 200

Process of Manufacture:

The processing steps to manufacture tablets were as follows:

-   -   1. A tablet from Example 2.3 was used as the tablet core.     -   2. A single station Manesty Type F 3 tablet press was equipped         with 0.3125 inch, round, standard concave plain tooling.     -   3. For Example 12.1, approximately 100 mg of Polyethylene Oxide         was placed in the die, the tablet core was manually centered in         the die (on top of the powder bed), an additional 100 mg of         Polyethylene Oxide was placed on top of the tablet in the die.     -   4. The materials were manually compressed by turning the         compression wheel.     -   5. For Example 12.2, approximately 50 mg of Polyethylene Oxide         was placed in the die, the tablet core was manually centered in         the die (on top of the powder bed), an additional 50 mg of         Polyethylene Oxide was placed on top of the tablet in the die.     -   6. The materials were manually compressed by turning the         compression wheel.     -   7. Step 4 and step 6 tablets were placed onto a tray placed in a         Hotpack model 435304 oven targeting 75° C. for 3 hours to cure         the compression coated tablets.         In vitro testing was performed as follows:

The tablets were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., using a Perkin Elmer UV/VIS Spectrometer Lambda 20 USP Apparatus, UV at 220 nM. The cured compression coated tablet dimensions and dissolution results are presented in Table 12.

TABLE 12 Example 12.1 Example 12.2 Tablet Weight (mg) 304 312 209 210 Dimensions Thickness (mm) 5.62 5.73 5.24 5.29 Diameter (mm) 9.10 9.10 7.61 7.54 Dissolution 0.5 hr   0 1 (% Released) 1 hr 0 15 (n = 2) 2 hr 1 47 4 hr 9 95 8 hr 82 96 12 hr  97 96

Example 13

In Example 13, five different 156 mg tablets (Examples 13.1 to 13.5) including 10, 15, 20, 30 and 40 mg of Oxycodone HCl were prepared using high molecular weight polyethylene oxide.

Compositions:

Exam- Exam- Exam- Exam- Exam- ple ple ple ple ple 13.1 13.2 13.3 13.4 13.5 mg/unit mg/unit mg/unit mg/unit mg/unit Ingredient Oxycodone HCl 10 15 20 30 40 Polyethylene oxide 138.5 133.5 128.5 118.5 108.5 (MW: approximately 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 1.5 1.5 1.5 1.5 1.5 Total Core Tablet 150 150 150 150 150 Weight (mg) Total Batch size 10 kg 10 kg 10 kg 10 kg 10 kg Coating Opadry film coating 6 6 6 6 6 Total Tablet Weight 156 156 156 156 156 (mg) Coating Batch Size 8.754 9.447 9.403 8.717 8.902 (kg) The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—16 quart was charged     in the following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   Remaining polyethylene oxide WSR 301 -   2. Step 1 materials were blended for 5 minutes with the I bar on. -   3. Magnesium stearate was charged into the “V” blender. -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag. -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press at 35,000 tph speed using 9/32 inch standard round,     concave (embossed) tooling. -   7. Step 6 tablets were loaded into a 24 inch Compu-Lab coating pan     at a pan load of 8.754 kg (Example 13.1), 9.447 kg (Example 13.2),     9.403 kg (Example 13.3), 8.717 kg (Example 13.4), 8.902 kg (Example     13.5). -   8. A temperature probe (wire thermocouple) was placed into the pan     directly above the tablet bed so that the probe tip was near the     moving bed of tablets. -   9. The pan speed was set to 7 rpm and the tablet bed was heated by     setting the inlet temperature to achieve a probe target temperature     of 75° C. The curing starting point (as described by method 4) was     initiated once the temperature probe indicated approximately 70° C.     (Example 13.1 at 68.3° C., Example 13.2 at 69.9° C., Example 13.3     and 13.4 at 70.0° C., and Example 13.5 at 71.0° C.). Once the target     probe temperature was achieved, the inlet temperature was adjusted     as necessary to maintain this target probe temperature. The tablets     were cured for 90 minutes. The pan speed was increased to 12 rpm at     approximately 60 minutes of curing (except for Example 13.5, the pan     speed was maintained at 7 rpm throughout curing). Samples were taken     after 30 minutes, 60 minutes and 90 minutes of curing. The     temperature profile of the curing processes for Examples 13.1 to     13.5 is presented in Tables 13.1.1 to 13.5.1 and in FIGS. 10 to 14. -   10. At the end of curing, magnesium stearate was added to the moving     be of tablets as an anti-tacking agent. The amount of magnesium     stearate added was 8.75 g (Example 13.1), 1.8887 g (Example 13.2),     1.8808 g (Example 13.3), 1.7400 g (Example 13.4), and 1.784 g     (Example 13.5). The magnesium stearate was weighed in a weigh boat     and was applied by manually dispensing (dusting) the powder across     the moving tablet bed. The pan speed was continued at 12 rpm     (Example 13.5 at 7 rpm) and the tablet bed was cooled by setting the     inlet temperature to 21° C. The tablet bed was cooled to an exhaust     temperature of <41° C. 11. The tablet bed was warmed using an inlet     setting of 55° C. The film coating was started once the exhaust     temperature achieved approximately 43° C. and continued until the     target weight gain of 4% was achieved. -   12. After film coating was completed, the pan speed was reduced (3     to 6 rpm) and the inlet temperature was set to 21° to 25° C. to cool     the system, the airflow was maintained at the current setting. -   13. The tablets were discharged.

In vitro testing including breaking strength tests and density measurement was performed as follows:

Tablets cured for 30 minutes and 60 minutes, and tablets cured for 90 minutes and coated were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×150 mm, column, using a mobile phase consisting of a mixture of acetonitrile and non basic potassium phosphate buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 8.0 and 12.0 hours. Tablet dimensions and dissolution results corresponding to the respective curing time and temperature are presented in Tables 13.1.2 to 13.5.2.

Uncured tablets, cured tablets and cured, coated tablets were subjected to a breaking strength test by applying a force of a maximum of 439 Newton using a Schleuniger Model 6D apparatus to evaluate tablet resistance to breaking or to a breaking strength test applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate the resistance to breaking.

The density of uncured tablets and tablets cured for different periods of time (30, 60 and 90 minutes samples) was determined by Archimedes principle, using a Top-loading Mettler Toledo balance Model # AB 135-S/FACT, Serial #1127430072 and a density determination kit 33360, according to the following procedure:

-   1. Set-up the Mettler Toledo balance with the Density Determination     Kit. -   2. Fill an appropriately sized beaker (200 ml) with hexane. -   3. Weigh the tablet in air and record the weight as Weight A. -   4. Transfer the same tablet onto the lower coil within the beaker     filled with hexane. -   5. Determine the weight of the tablet in hexane and record the     weight as Weight B. -   6. Perform the density calculation according to the equation

${\rho = {\frac{A}{A - B} \cdot \rho_{0}}},$

wherein

-   -   ρ: Density of the tablet     -   A: Weight of the tablet in air     -   B: Weight of the tablet when immersed in the liquid     -   ρ₀: Density of the liquid at a given temperature (density of         hexane at 20° C.=0.660 g/ml (Merck Index)

-   7. Record the density.     The reported density values are mean values of 3 tablets and all     refer to uncoated tablets.

The results are presented in the following Tables.

TABLE 13.1.1 Temperature profile of the curing process for Ex. 13.1 Total Curing Set inlet Actual inlet Probe Exhaust Time time temperature temperature temperature temperature (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 27 26.9 26.8 25.7 10 — 75 74.9 59.5 56.8 15 0 85 84.8 68.3 65.5 Curing starts 20 5 85 84.7 71 68.4 26 11 85 84.8 72.8 70.1 30 15 85 84.8 74 70.9 45 30 83 83 74.8 74.7 30 min sample 55 40 81 81.2 74.8 76 61 46 81 81.2 74.7 75.9 65 50 81 81 74.8 75.8 70 55 81 81 74.7 75.8 75 60 81 81.1 75 75.9 60 min sample 85 70 81 81.1 74.6 75.8 95 80 81 81.1 74.8 75.9 105 90 81 80.9 74.9 76 End of curing, 90 min sample 112 — 21 35.3 49 55.6 128 — 21 33.4 32 — ¹determined according to method 4, ²temperature measured at the inlet; ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 13.1.2 Example 13.1 30 min 60 min 90 min Uncured cure cure cure, coated (n = 5) (n = 5) (n = 5) (n = 5) Tablet Weight (mg) 153 153    152    158    Dimensions Thickness (mm) 4.63 4.98 4.89 4.89 Diameter (mm) 7.14 7.00 6.98 6.98 Breaking 80 196 ¹    196 ¹    438 ²    strength (N) n = 3 n = 3 n = 6 Dissolution 1 hr — 25 (9.5) 24 (8.4) 27 (7.3) (% Released) 2 hr — 39 (7.7) 39 (8.7) 43 (6.6) SGF 4 hr — 62 (7.0) 62 (5.8) 67 (6.8) 8 hr — 89 (4.7) 91 (5.0) 92 (2.9) 12 hr  — 100 (3.3)  100 (3.6)  101 (2.4)  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N. ² maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 438 N.

TABLE 13.2.1 Temperature profile of the curing process for Ex. 13.2 Total Curing Set inlet Actual inlet Probe Exhaust Time time temperature temperature temperature temperature (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 23 22.7 26.1 23.8 5 — 85 81 55.7 51.1 10 — 85 85.1 63.7 62.3 21  0 85 84.8 69.9 69.1 Curing starts 31 10 85 85.1 72.4 70.9 41 20 85 85.1 73.7 72.5 51 30 82 82 74.8 75.8 30 min sample 61 40 82 81.9 75 76.2 71 50 81 81 74.8 75.9 81 60 81 80.8 75 75.9 60 min sample 91 70 81 81 74.9 76 101 80 80.5 80.5 74.8 75.8 111 90 80.5 80.5 74.8 75.7 End of curing, 90 min sample 118 — 21 23.1 50 55.1 131 — 21 22.4 34.1 37.7 ¹determined according to method 4, ²temperature measured at the inlet; ³temperature measured using the temperature probe (wire thermocouple), ⁴temperature measured at the exhaust.

TABLE 13.2.2 Example 13.2 30 min 60 min 90 min Uncured cure cure cure, coated (n = 5) (n = 5) (n = 5) (n = 5) Tablet Weight (mg) 152 153    152    157    Dimensions Thickness (mm) 4.69 4.99 4.90 4.84 Diameter (mm) 7.14 6.98 6.95 6.95 Breaking 62 196 ¹    196 ¹    196 ¹    strength (N) n = 6 n = 6 n = 6 Dissolution 1 hr — 23 (10.6) 22 (8.5) 25 (5.2) (% Released) 2 hr — 38 (10.1) 37 (7.7) 41 (4.6) SGF 4 hr — 64 (9.5)  61 (8.1) 65 (3.6) 8 hr — 92 (6.8)  90 (4.6) 91 (2.4) 12 hr  — 100 (3.4)  100 (3.2)  99 (2.9) ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 13.3.1 Temperature profile of the curing process for Ex. 13.3: Total Curing Set inlet Actual inlet Probe Exhaust Time time temperature temperature temperature temperature (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 25 24.9 27.8 26.2 5 — 90 85 58.2 53.9 10 — 90 89.8 67 65.1 13  0 90 90.1 70 68.3 Curing starts 23 10 90 90 74.6 72.2 33 20 86 85.9 74.7 73.4 43 30 83 83.1 75.4 76.5 30 min sample 53 40 82 82.1 74.9 76.3 63 50 81.5 81.8 75 76.4 73 60 81.5 81.5 74.7 76.1 60 min sample 83 70 81.5 81.5 75 76.1 93 80 81.5 81.6 75 76.1 103 90 81.5 81.3 75 76.1 End of curing, 90 min sample 109 — 21 35.5 50 57.5 121 — 21 22.6 33.8 39.3 ¹determined according to method 4, ²temperature measured at the inlet; ³temperature measured using the temperature probe (wire thermocouple), ⁴temperature measured at the exhaust.

TABLE 13.3.2 Example 13.3 30 min 60 min 90 min Uncured cure cure cure, coated (n = 5) (n = 5) (n = 5) (n = 5) Tablet Weight (mg) 154 154    152    160    Dimensions Thickness (mm) 4.56 4.85 4.79 4.77 Diameter (mm) 7.13 7.01 6.96 6.98 Breaking 83 196 ¹    196 ¹    196 ¹    strength (N) n = 6 n = 6 n = 6 Dissolution 1 hr — 22 (5.8) 26 (9.2) 23 (5.7) (% Released) 2 hr — 37 (6.4) 42 (8.6) 39 (4.7) SGF 4 hr — 61 (6.3) 67 (6.3) 64 (3.7) 8 hr — 90 (4.5) 93 (3.3) 92 (2.7) 12 hr  — 99 (3.1) 101 (2.2)  101 (1.8)  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 13.4.1 Temperature profile of the curing process for Ex. 13.4: Total Curing Set inlet Actual inlet Probe Exhaust Time time temperature temperature temperature temperature (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 25 25 24.6 23.4 5 — 90 85 46.8 51 10 — 90 89.9 56.6 63.8 15 — 90 89.8 68.5 68.7 16  0 90 90.1 70 69.5 Curing starts 26 10 90 90 73.6 72.9 36 20 86 86 75.4 76.8 46 30 84 84 75.4 77.2 30 min sample 56 40 83 82.9 75.1 76.8 66 50 82 81.4 74.8 76.6 76 60 82 81.7 74.7 76.3 60 min sample 86 70 82 82.1 75 76.3 96 80 82 82.1 75.1 76.3 106 90 82 82.1 75.1 76.4 End of curing, 90 min sample 112 — 21 33.8 55.9 50 126 — 21 22.1 31.6 34.6 ¹determined according to method 4, ²temperature measured at the inlet; ³temperature measured using the temperature probe (wire thermocouple), ⁴temperature measured at the exhaust.

TABLE 13.4.2 Example 13.4 30 min 60 min 90 min Uncured cure cure cure, coated (n = 5) (n = 5) (n = 5) (n = 5) Tablet Weight (mg) 150 151    150    159    Dimensions Thickness (mm) 4.43 4.73 4.67 4.68 Diameter (mm) 7.13 7.00 6.97 7.00 Breaking 65 196 ¹    196 ¹    196 ¹    strength (N) n = 6 n = 6 Dissolution 1 hr — 29 (3.2) 25 (7.9) 24 (5.5) (% Released) 2 hr — 47 (3.1) 42 (6.7) 41 (5.2) SGF 4 hr — 71 (2.4) 67 (5.2) 67 (6.2) 8 hr — 92 (2.5) 92 (4.3) 94 (3.2) 12 hr  — 99 (2.1) 100 (2.8)  101 (2.2)  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 13.5.1 Temperature profile of the curing process for Ex. 13.5: Total Curing Set inlet Actual inlet Probe Exhaust Time time temperature temperature temperature temperature (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 80 69.2 39.8 35.6 10 — 90 80.2 64.9 65.6 20 0 90 90.2 70.9 71 Curing starts 25 5 90 89.9 71.7 72.4 30 10 90 90.1 72.8 73.4 35 15 85 87.1 74.1 76.1 50 30 85 85 75.2 77.5 30 min sample 60 40 83 83.2 74.7 76.8 80 60 83 83.1 75.1 76.5 60 min sample 90 70 83 83 75.3 76.6 100 80 80 79.1 74.4 76 110 90 80 80.1 73.6 74.7 End of curing, 90 min sample 115 — 21 39.6 55.6 59.4 120 — 21 24.5 41.5 45.2 125 — 21 23 37.7 40.7 ¹determined according to method 4, ²temperature measured at the inlet; ³temperature measured using the temperature probe (wire thermocouple), ⁴temperature measured at the exhaust.

TABLE 13.5.2 Example 13.5 90 min 30 min 60 min 90 min cure, Uncured cure cure cure coated (n = 5) (n = 5) (n = 5) (n = 5) (n = 5) Tablet Weight (mg) 156 157    154    153    158    Dimensions Thickness (mm) 4.45 4.66 4.57 4.52 4.51 Diameter (mm) 7.12 7.06 7.04 7.03 7.08 Breaking 90 438 ¹   438 ¹   438 ¹   438 ¹   strength (N) Relaxed diameter — 4.57 4.68 4.69 4.67 (mm) post breaking strength test (NLT 15 min relax period) n = 6 n = 6 Dissolution 1 hr — 28 (5.0) 29 (5.9) — 26 (1.4) (% 2 hr — 45 (5.2) 45 (5.6) — 42 (1.4) Released) 4 hr — 69 (4.8) 70 (4.4) — 68 (2.0) SGF 8 hr — 93 (4.2) 94 (4.0) — 94 (4.0) 12 hr  — 98 (3.9) 102 (5.2)  — 99 (5.1) ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 438 N.

TABLE 13.6 Density (g/cm³)¹ Density change 30 min 60 min 90 min after curing Uncured cure cure cure (%)² Example 13.1 1.172 1.131 1.134 1.137 −2.986 Example 13.2 1.174 1.137 1.137 1.140 −2.896 Example 13.3 1.179 1.151 1.152 1.152 −2.290 Example 13.4 1.182 1.167 1.168 1.172 −0.846 Example 13.5 1.222 1.183 1.183 1.187 −2.864 ¹The density value is a mean value of 3 tablets measured; ²The density change after curing corresponds to the observed density change in % of the tablets cured for 90 min in comparison to the uncured tablets.

Example 14

In Example 14, five different 156 mg tablets (Examples 14.1 to 14.5) including 10, 15, 20, 30 and 40 mg of oxycodone HCl were prepared using high molecular weight polyethylene oxide, in a larger batch size compared to Example 13.

Compositions:

Exam- Exam- Exam- Exam- Exam- ple ple ple ple ple 14.1 14.2 14.3 14.4 14.5 mg/unit mg/unit mg/unit mg/unit mg/unit Ingredient Oxycodone HCl 10 15 20 30 40 Polyethylene oxide 138.5 133.5 128.5 118.5 108.5 (MW: approximately 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 1.5 1.5 1.5 1.5 1.5 Total Core Tablet 150 150 150 150 150 Weight (mg) Total Batch size 100 kg 100 kg 100 kg 100 kg 100 kg Coating Opadry film coating 6 6 6 6 6 Total Tablet Weight 156 156 156 156 156 (mg) Coating Batch Size 97.480 98.808 97.864 99.511 98.788 (kg) The processing steps to manufacture tablets were as follows:

-   1. The magnesium stearate was passed through a Sweco Sifter equipped     with a 20 mesh screen, into a separate suitable container. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   Remaining polyethylene oxide WSR 301 -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. Magnesium stearate was charged into the Gemco “V” blender. -   5. Step 4 materials were blended for 3 minutes with the I bar off. -   6. Step 5 blend was charged into clean, tared, stainless steel     containers. -   7. Step 6 blend was compressed to target weight on a 40 station     tablet press at 135,000 tph using 9/32 inch standard round, concave     (embossed) tooling. -   8. Step 7 tablets were loaded into a 48 inch Accela-Coat coating pan     at a load of 97.480 kg (Example 14.1), 98.808 kg (Example 14.2),     97.864 kg (Example 14.3), 99.511 kg (Example 14.4) and 98.788 kg     (Example 14.5). -   9. The pan speed was set to 7 rpm and the tablet bed was heated by     setting the exhaust air temperature to achieve an inlet air     temperature of 75° C. The tablets were cured at the target inlet     temperature for 1 hour (Examples 14.1 to 14.5). The starting point     used for the determination of the curing time according to method 1     was the point when the inlet temperature achieved the target     temperature of 75° C. The temperature profile of the curing     processes of Examples 14.1 to 14.5 is presented in Tables 14.1.1 to     14.5.1 and in FIGS. 15 to 19. -   10. The pan speed was continued at 7 rpm for Examples 14.2, 14.4 and     14.5. The pan speed was increased up to 10 rpm for Example 14.1 and     up to 8 rpm for Example 14.3. For Examples 14.2 to 14.5, 20 g of     magnesium stearate was added as an anti-tacking agent. The tablet     bed was cooled by slowly lowering the exhaust temperature setting     (Example 14.1) or by immediately setting the exhaust temperature     setting to 25° C. (Example 14.2) or 30° C. (Examples 14.3 to 14.5).     until a specific exhaust temperature of 30 to 34° C. was reached. -   11. The tablet bed was warmed using an exhaust air temperature to     target a 55° C. inlet temperature. The film coating was started once     the exhaust temperature approached 39° C. and continued until the     target weight gain of 4% was achieved. -   12. After coating was completed, the pan speed was set to 1.5 rpm     and the exhaust temperature was set to 27° C., the airflow was     maintained at the current setting and the system cooled to an     exhaust temperature of 27-30° C. -   13. The tablets were discharged.

In vitro testing including breaking strength tests and stability tests was performed as follows:

Tablets cured for 1 hour and coated were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) at 37° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×150 mm, 3 μm column, using a mobile phase consisting of a mixture of acetonitrile and non basic potassium phosphate buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 6.0, 8.0 and 12.0 hours. Tablet dimensions and dissolution results corresponding to the respective curing time and temperature are presented in Tables 14.1.2 to 14.5.2.

Uncured tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 Apparatus to evaluate tablet resistance to breaking.

Cured, coated tablets were subjected to a stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently testing the tablets in vitro as described above. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage, sample time points regarding dissolution test include 1.0, 2.0, 4.0, 8.0 and 12.0 hours.

Cured, coated tablets were subjected to a further stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently subjecting the tablets to the assay test to determine the content of oxycodone HCl in the tablet samples. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage. In the assay test, oxycodone hydrochloride was extracted from two sets of ten tablets each with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

Cured, coated tablets were subjected to a further stability test by storing them in 100 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity) for a certain period of time and subsequently subjecting the tablets to the oxycodone-N-oxide (ONO) test to determine the content of the degradation product oxycodone-N-oxide and unknown degradation products in percent by weight, relative to the oxycodone HCl label claim. Sample time points regarding storage include initial sample (i.e. prior to storage), one month, two months, three months and six months of storage. In the ONO test, oxycodone hydrochloride and its degradation products were extracted from a set of ten tablets with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 206 nm.

The density of uncured tablets, cured tablets and cured/coated tablets was determined as described for Example 13.

The results are presented in the following Tables.

TABLE 14.1.1 Temperature profile of the curing process for Ex. 14.1 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments 0 — — — — 7 Load pan, start warming 20 — 65 57 56 7 21 — 65.0 7 28 — 70.0 7 30 — 72.0 64 63 7 36 0 75.0 65 65 7 Curing starts 0 min sample 43 7 73.2 7 46 10 73 67 67 51 15 72.2 7 15 min sample 56 20 71.8 67 67 8 66 30 75.0 68 68 8 30 min sample 76 40 73.0 68 68 8 81 45 74.8 8 45 min sample 86 50 74.3 69 69 8 92 56 72.3 8 96 60 71.0 69 69 8 End of curing, 60 min sample, Mg stearate not used, start cool down, tablet flow was sticky 101 — 62.0 8 Tablet flow starting to get chunky 104 — 59.2 9 Flow very chunky (tablet bed “sheeting”) 106 — 57 62 62 10 109 — 54.9 9 Tablet flow still slightly chunky, but better 110 — 53.2 8 Back to normal tablet flow 116 — 48.0 58 58 8 126 — 29.0 30 46 7 132 — 24.0 30 33 7 ¹determined according to method 1, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 14.1.2 Example 14.1 60 min 60 min cure, cure coated Uncured (n = 5) (n = 5) Tablet Weight (mg)   150 (n = 120) 150    158  Dimensions Thickness 4.42 (n = 5) 4.71    4.75 (mm) Diameter (mm) 7.14 (n = 5) 7.05    7.07 Breaking    68 (n = 100) 196 ¹    196 ¹ strength (N) n = 6 Dissolution 1 hr — — 25 (% Released) 2 hr — — 42 SGF 4 hr — — 67 8 hr — — 94 12 hr  — — 101  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 14.1.3 Stability tests Example 14.1, storage at 25° C./60% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 25 24 24 23 23 (% Released) 2 hr 42 40 38 38 39 (n = 6 4 hr 67 64 61 61 64 SGF 8 hr 94 90 87 89 90 12 hr  101 99 94 100 97 Assay test Assay 1 9.8 9.8 9.8 9.8 9.7 (mg oxycodone Assay 2 9.8 9.9 9.8 9.9 9.8 HCl) Average 9.8 9.8 9.8 9.9 9.8 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.1.4 Stability tests Example 14.1, storage at 40° C./75% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 25 25 25 24 23 (% Released) 2 hr 42 — 41 38 39 (n = 6) 4 hr 67 66 63 62 64 SGF 8 hr 94 — 89 88 90 12 hr  101 100 96 98 96 Assay test Assay 1 9.8 9.8 9.7 9.6 9.8 (mg oxycodone Assay 2 9.8 10.0 9.7 9.8 9.8 HCl) Average 9.8 9.9 9.7 9.7 9.8 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.2.1 Temperature profile of the curing process for Ex. 14.2 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments 0 — 18 50 20 7 Load pan, start warming 1 — 41.0 7 5 — 50.0 62.0 8 — 67.7 51.0 50.5 7 Slowly adjusting exhaust set 10 — 71 56 55 14 0 75.0 61.7 61.9 7 curing starts, 0 min sample 19 5 77.2 61.7 64.8 7 21 7 77.8 7 High inlet, then dropped to 71° C. 24 10 68.9 65.3 65.3 7 29 15 70.6 66.1 65.5 7 15 min sample 33 19 72.6 7 34 20 73.6 67.0 66.3 7 36 22 75.0 7 39 25 75.9 67.0 67.3 7 44 30 73.3 67.0 67.4 7 30 min sample 49 35 70.1 67.2 67.0 7 54 40 71.7 67.5 67.3 7 Couple of tablets sticking at pan support arms, no permanent stick 59 45 74.3 68.0 67.9 7 45 min sample 64 50 75 68 68 7 66 52 73.6 68.0 68.2 7 69 55 72.4 68.0 68.1 7 74 60 73.0 68 68 7 End of curing, 60 min sample, add 20 g Mg stearate, tablet flow was slightly sticky (based on visual cascade flow), flow instantly improved after adding Mg stearate 75 — 73 25 68 7 Normal tablet flow observed 78 — 44.7 25 62.3 7 during cool down 81 — 36.8 25 57.4 7 84 — 31.8 25 54.6 7 85 — 30 25 53 7 94 — 23 25 33 7 ¹determined according to method 1, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 14.2.2 Example 14.2 60 min 60 min cure, cure coated Uncured (n = 5) (n = 5) Tablet Weight (mg)   150 (n = 120) 149    156  Dimensions Thickness 4.38 (n = 5) 4.68    4.70 (mm) Diameter (mm) 7.13 (n = 5) 7.07    7.09 Breaking    70 (n = 100) 196 ¹    196 ¹ strength (N) n = 6 Dissolution 1 hr — — 23 (% Released) 2 hr — — 39 SGF 4 hr — — 64 8 hr — — 93 12 hr  — — 100  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 14.2.3 Stability tests Example 14.2, storage at 25° C./60% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 23 24 26 22 24 (% Released) 2 hr 39 40 41 37 40 (n = 6) 4 hr 64 65 65 61 65 SGF 8 hr 93 91 90 90 91 12 hr  100 100 97 99 99 Assay test Assay 1 14.6 14.9 14.6 14.7 14.8 (mg oxycodone Assay 2 14.8 14.9 14.7 14.8 14.9 HCl) Average 14.7 14.9 14.7 14.7 14.8 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.2.4 Stability tests Example 14.2, storage at 40° C./75% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 23 25 26 22 24 (% Released) 2 hr 39 41 42 36 40 (n = 6) 4 hr 64 66 66 58 65 SGF 8 hr 93 94 92 87 91 12 hr  100 102 97 97 98 Assay test Assay 1 14.6 14.8 14.7 14.6 14.9 (mg oxycodone Assay 2 14.8 14.8 14.7 14.5 14.7 HCl) Average 14.7 14.8 14.7 14.5 14.8 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.3.1 Temperature profile of the curing process for Ex. 14.3 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments 0 — 17.1 50 18 7 Load pan, start warming 5 — 61.0 50 42.5 7 10 — 70.2 56 55.8 7 15 0 75.0 61.6 61.9 7 Curing starts, 0 min sample 20 5 78.5 62.8 65.4 7 22 7 79.0 62.8 66.3 7 Inlet high 25 10 69.7 65.6 65.6 7 30 15 68.4 66.0 65.3 7 15 min sample 35 20 72.4 66.7 66.1 7 40 25 75.6 67.5 67.3 7 45 30 76.9 68.0 67.9 7 30 min sample 55 40 73.0 68.4 68.2 7 60 45 73.9 68.6 68.4 7 45 min sample 65 50 75 68.9 68.8 7 68 53 — — — 7 Couple of tablets (1-4) sticking at pan support arms, good tablet flow 70 55 76.2 69.6 69.6 8 75 60 77.0 70.5 70.8 8 End of curing, 60 min sample, add 20 g Mg stearate, tablet flow instantly improved 76 — 76 30 71 8 Normal tablet flow observed 79 — 43.9 30 60.6 8 during cool down 85 — 31.1 30 54.1 8 No sticking 86 — 30 30 53 8 96 — 23 30 33 8 ¹determined according to method 1, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 14.3.2 Example 14.3 60 min 60 min cure, cure coated Uncured (n = 5) (n = 5) Tablet Weight (mg)   150 (n = 120) 150    156  Dimensions Thickness 4.38 (n = 5) 4.69    4.67 (mm) Diameter (mm) 7.14 (n = 5) 7.08    7.10 Breaking    64 (n = 110) 196 ¹    196 ¹ strength (N) n = 6 Dissolution 1 hr — — 24 (% Released) 2 hr — — 41 SGF 4 hr — — 66 8 hr — — 92 12 hr  — — 98 ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 14.3.3 Stability tests Example 14.3, storage at 25° C./60% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 24 25 22 24 21 (% Released) 2 hr 41 42 38 40 38 (n = 6) 4 hr 66 69 61 66 63 SGF 8 hr 92 96 89 91 88 12 hr  98 102 97 99 96 Assay test Assay 1 19.6 19.4 19.5 19.4 19.8 (mg oxycodone Assay 2 19.4 19.3 19.4 19.4 19.4 HCl) Average 19.5 19.4 19.4 19.4 19.6 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.3.4 Stability tests Example 14.3, storage at 40° C./75% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 24 27 24 23 22 (% Released) 2 hr 41 44 40 39 40 (n = 6) 4 hr 66 70 63 63 65 SGF 8 hr 92 94 90 89 90 12 hr  98 102 98 98 98 Assay test Assay 1 19.6 19.3 19.6 19.3 19.7 (mg oxycodone Assay 2 19.4 19.3 19.7 19.4 19.4 HCl) Average 19.5 19.3 19.6 19.4 19.6 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.4.1 Temperature profile of the curing process for Ex. 14.4 Set Actual Total Curing Inlet Bed exhaust exhaust time time temp. temp. temp. temp. (min.) (min.)¹ (° C.)² (° C.)³ (° C.) (° C.)⁴ Comments⁵ 0 Load pan, start warming 3 63.0 46.5 50.0 41.2 5 66.7 49.9 50.0 48.0 10 0 75.0 60.5 60.0 59.0 curing starts, 0 min sample 14 4 78.4 65.2 61.5 63.6 15 5 79.1 66.0 61.5 64.5 20 10 67.6 66.2 63.0 64.7 24 15 69.2 66.7 65.7 64.9 15 min sample 28 19 73.0 67.8 66.4 65.8 29 20 73.5 68.0 67.0 66.0 32 23 75.6 69.0 67.0 66.7 34 25 75.9 69.4 67.0 67.0 39 30 76.5 70.2 67.7 67.7 30 min sample 44 35 76.8 70.8 68.2 68.2 47 38 76.7 71.0 68.8 68.4 Couple of tablets sticking at pan support arms, no permanent sticking 49 40 77.4 71.0 69.3 68.7 52 43 78.7 71.5 69.5 69.2 54 45 79.1 72.1 70.0 69.5 45 min sample 58 49 — 73.3 — — 59 50 81.0 73.8 70.1 70.8 65 56 73.0 74.1 71.7 71.5 69 60 74.0 74.5 71.7 71.3 End of curing, 60 min sample, add 20 g Mg stearate, start cool down, tablet flow slightly sticky (based on visual cascade flow), still couple of tablets sticking at support arms, flow/cascade instantly improved after adding Mg stearate 72 — 48.9 65.3 30.0 65.3 Normal tablet flow observed 75 — 39.7 58.6 30.0 56.8 during cool down 79 — 33.2 56.4 30.0 54.6 84 — 27.7 50.0 30.0 48.4 ¹determined according to method 1, ²temperature measured at the inlet, ³tablet bed temperature, i.e. temperature of extended release matrix formulations, measured with an IR gun, ⁴temperature measured at the exhaust, ⁵The pan speed was 7 rpm throughout the curing process.

TABLE 14.4.2 Example 14.4 60 min 60 min cure, cure coated Uncured (n = 5) (n = 5) Tablet Weight (mg)   150 (n = 120) 149    157  Dimensions Thickness 4.34 (n = 5) 4.60    4.63 (mm) Diameter (mm) 7.14 (n = 5) 7.09    7.14 Breaking    61 (n = 100) 196 ¹    196 ¹ strength (N) n = 6 Dissolution 1 hr — — 22 (% Released) 2 hr — — 39 SGF 4 hr — — 66 8 hr — — 94 12 hr  — — 100  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 14.4.3 Stability tests Example 14.4, storage at 25° C./60% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 22 23 24 24 23 (% Released) 2 hr 39 39 39 41 40 (n = 6) 4 hr 66 64 63 68 65 SGF 8 hr 94 91 88 93 91 12 hr  100 98 96 99 98 Assay test Assay 1 28.8 28.8 28.4 28.8 29.2 (mg oxycodone Assay 2 29.1 29.0 28.8 28.8 29.2 HCl) Average 29.0 28.9 28.6 28.8 29.2 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.4.4 Stability tests Example 14.4, storage at 40° C./75% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 22 26 24 24 24 (% Released) 2 hr 39 44 41 41 41 (n = 6) 4 hr 66 70 64 67 67 SGF 8 hr 94 93 88 92 93 12 hr  100 99 96 98 98 Assay test Assay 1 28.8 29.3 28.2 29.0 28.4 (mg oxycodone Assay 2 29.1 29.3 28.1 28.9 28.6 HCl) Average 29.0 29.3 28.1 28.9 28.5 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.5.1 Temperature profile of the curing process for Ex. 14.5 Set Actual Total Curing Inlet Bed exhaust exhaust time time temp. temp. temp. temp. (min.) (min.)¹ (° C.)² (° C.)³ (° C.) (° C.)⁴ Comments⁵ 0 — 16.6 30 60.0 19.7 Load pan, start warming 1 — — 32 60.0 — 4 — 56.8 39.8 60.0 36.7 5 — 60.1 43.9 60.0 40.4 8 — 66.8 52.5 60.0 49.4 10 — 69.1 56.9 60.0 53.8 13 — 71.7 61.3 60.0 58.8 15 — 73.3 63.5 61.0 60.8 17 0 75.0 65.3 63.0 62.5 Curing starts, 0 min sample 21 4 77.7 67.3 66.0 65.0 23 6 78.8 68.1 67.0 65.9 25 8 79.9 69.3 67.0 66.7 27 10 80.9 69.5 67.0 67.3 30 13 82.4 70.1 67.0 68.2 32 15 83.1 70.8 70.0 68.7 15 min sample 37 20 80.9 72.4 70.4 69.4 38 21 80.9 71.8 71.0 69.5 42 25 82.5 73.1 72.0 70.4 Good tablet flow and cascade 45 28 84.2 76.6 71.0 72.2 47 30 82.7 77.6 72.2 74.1 30 min sample 49 32 72.9 74.7 72.2 73.2 52 35 71.2 73.8 72.2 71.4 Tablet flow slightly sticky, 1-2 tablets sticking at support arms 56 39 75.4 74.7 72.2 71.5 57 40 75.9 74.7 72.2 71.9 60 43 76.9 75.5 72.2 72.8 62 45 75.4 75.3 72.2 72.9 45 min sample 66 49 73.4 74.5 72.2 71.8 Tablet flow slightly sticky, 1-2 tablets sticking at support arms (not permanent sticking) 69 52 75.0 75.1 72.2 71.9 72 55 75.8 75.4 72.2 72.4 74 57 74.8 74.8 72.2 72.5 77 60 73.9 74.9 72.2 72.2 End of curing, 60 min sample, add 20 g Mg stearate, instantly improved flow/cascade start cool down, no sticking at pan support arms, 80 — 46.8 64.9 30.0 64.7 Cooling — — — — 30.0 — 2 tablets sticking at support arms (not permanent sticking) 82 — 40.3 58.6 30.0 57.4 Tablets still appear bouncy, no sticking observed 84 — 35.8 57.4 30.0 55.6 Normal tablet flow observed 86 — 32.5 55.9 30.0 54.2 during cool down period. 87 — 30.3 54.1 30.0 52.8 Continue cooling to exhaust 89 — 28.8 51.8 30.0 51.3 temperature of 30-34° C. for 91 — 26.9 47.2 30.0 47.9 coating start-up 97 — — ~29 30.0 — Top of bed 30.3° C., bottom of bed 28.5° C. ¹determined according to method 1, ²temperature measured at the inlet, ³tablet bed temperature, i.e. temperature of extended release matrix formulations, measured with an IR gun, ⁴temperature measured at the exhaust, ⁵The pan speed was 7 rpm throughout the curing process.

TABLE 14.5.2 Example 14.5 60 min 60 min cure, cure coated Uncured (n = 5) (n = 5) Tablet Weight (mg)   150 (n = 120) 149    155  Dimensions Thickness 4.30 (n = 5) 4.49    4.52 (mm) Diameter (mm) 7.15 (n = 5) 7.10    7.15 Breaking    55 (n = 110) 196 ¹    196 ¹ strength (N) n = 6 Dissolution 1 hr — — 24 (% Released) 2 hr — — 41 SGF 4 hr — — 68 8 hr — — 93 12 hr  — — 98 ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N.

TABLE 14.5.3 Stability tests Example 14.5, storage at 25° C./60% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 24 25 27 23 25 (% Released) 2 hr 41 43 44 40 43 (n = 6) 4 hr 68 69 69 66 69 SGF 8 hr 93 94 93 89 92 12 hr  98 98 97 96 96 Assay test Assay 1 37.8 38.4 36.9 37.6 39.2 (mg oxycodone Assay 2 37.9 37.6 36.5 38.1 39.2 HCl) Average 37.8 38.0 36.7 37.9 39.2 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.5.4 Stability tests Example 14.5, storage at 40° C./75% RH Storage time Initial 1 month 2 months 3 months 6 months Dissolution 1 hr 24 26 27 25 25 (% Released) 2 hr 41 — 45 42 43 (n = 6) 4 hr 68 71 72 68 69 SGF 8 hr 93 — 95 93 92 12 hr  98 97 98 99 95 Assay test Assay 1 37.8 38.3 37.3 37.6 37.9 (mg oxycodone Assay 2 37.9 38.6 36.9 37.6 38.1 HCl) Average 37.8 38.5 37.1 37.6 38.0 Degradation oxycodone N-oxide ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products test (%)¹ Each individual ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 unknown (%)¹ Total degradation ≦0.1 ≦0.1 ≦0.1 ≦0.1 ≦0.1 products (%)¹ ¹relative to the label claim of oxycodone HCl.

TABLE 14.6 Density Density Density (g/cm³) change change Cured after after curing and curing and coating Uncured Cured Coated (%) (%) Example 14.1 1.186 1.145 1.138 −3.457 −4.047 Example 14.2 1.184 1.152 1.129 −2.703 −4.645 Example 14.3 1.183 1.151 1.144 −2.705 −3.297 Example 14.4 1.206 1.162 1.130 −3.648 −6.302 Example 14.5 1.208 1.174 1.172 −2.815 −2.980

Example 15

In Example 15, two different Oxycodone HCl tablet formulations were prepared using high molecular weight polyethylene oxide. One formulation at 234 mg tablet weight (Example 15.1) with 60 mg of Oxycodone HCl and one formulation at 260 mg tablet weight (Example 15.2) with 80 mg of Oxycodone HCl.

Compositions:

Example 15.1 Example 15.2 mg/unit mg/unit Ingredient Oxycodone HCl 60 80 Polyethylene oxide (MW: 162.75 167.5 approximately 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 2.25 2.50 Total Core Tablet Weight (mg) 225 250 Total Batch size 10 kg 10 kg Coating Opadry film coating 9 10 Total Tablet Weight (mg) 234 260 Coating Batch Size (kg) 8.367 8.205 The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—16 quart was charged     in the following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride (screened through a 20-mesh screen)     -   Remaining polyethylene oxide WSR 301 -   2. Step 1 materials were blended for 5 minutes with the I bar on. -   3. Magnesium stearate was charged into the “V” blender (screened     through a 20-mesh screen). -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag (note: two 5 kg     blends were prepared to provide 10 kgs of tablet blend for     compression). -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press at 35,000 tph speed using ⅜ inch standard round,     concave (embossed) tooling. A sample of tablet cores was taken. -   7. Step 6 tablets were loaded into a 24 inch Compu-Lab coating pan     at a pan load of 8.367 kg (Example 15.1) and 8.205 kg (Example     15.2). -   8. A temperature probe (wire thermocouple) was placed into the pan     directly above the tablet bed so that the probe tip was near the     cascading bed of tablets. -   9. The pan speed was set to 10 rpm and the tablet bed was heated by     setting the inlet temperature to achieve an exhaust target     temperature of 72° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature achieved 72° C.     The inlet temperature was adjusted as necessary to maintain the     target exhaust temperature. The tablets were cured for 15 minutes.     The pan speed was maintained at 10 rpm. The temperature profile of     the curing processes for Examples 15.1 and 15.2 is presented in     Tables 15.1.1 and 15.2.1. -   10. The pan speed was continued at 10 rpm. The inlet temperature was     set to 22° C. and the tablet bed was cooled until an exhaust     temperature of 30.0° C. was achieved. A sample of cured tablets was     taken at the end of cooling. -   11. The tablet bed was warmed using an inlet setting of 53° C. The     filmcoating was started once the exhaust temperature achieved     approximately 41° C. and continued until the target weight gain of     4% was achieved. The pan speed was increased up to 20 rpm during     filmcoating. -   12. After filmcoating was completed, the pan speed was reduced and     the inlet temperature was set to 22° C., the airflow was maintained     at the current setting and the system cooled to an exhaust     temperature of <30° C. A sample of cured/coated tablets was taken. -   13. The tablets were discharged.

In vitro testing including breaking strength tests was performed as follows:

Core tablets (uncured), 15 minute cured tablets and cured/coated tablets were tested in vitro using USP Apparatus 1 (basket with a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 6.0, 8.0, 12.0 and 16.0 hours.

Core tablets (uncured), 15 minute cured tablets and cured/coated tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 apparatus to evaluate tablet resistance to breaking.

Tablet dimensions and dissolution results are presented in Tables 15.1.2 to 15.2.2.

TABLE 15.1.1 Temperature profile of the curing process for Ex. 15.1 Temperature Total Curing Set Actual Time time inlet inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 22 to 85 47.4 — 26.4 Start heating 10 — 85 81.3 66.3 62.0 20 — 85 84.8 73.7 70.4 Good tablet flow, no sticking 25.5 0 85 to 74 85.0 75.1 72.0 Start of curing; 74° C. inlet set too low, exhaust dropped to 70.9° C., reset inlet to 80° C. 30.5 5 80 80.0 73.6 71.9 Good tablet flow, no sticking 35.5 10 75 75.8 72.2 73.3 Good tablet flow, no sticking 40.5 15 73 to 22 72.8 70.6 71.9 End of curing, good tablet flow, no sticking, start cooling 60 — 22 21.5 27.9 31.4 61 — 22 22.0 27.2 29.7 End cooling, no sticking observed during cool down, good tablet flow, take cured tablet sample ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 15.1.2 Example 15.1 Uncured 15 min cure Coated n = 3 n = 3 n = 6 Dissolution 1 hr 28 28 24 (% Released) 2 hr 44 44 41 SGF 4 hr 69 69 67 6 hr 85 85 84 8 hr 95 95 93 12 hr  102 102 99 16 hr  104 103 102

TABLE 15.2.1 Temperature profile of the curing process for Ex. 15.2 Temperature Total Curing Set Actual Time time inlet inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 22 to 80 23.3 27.7 25.5 Start heating 10 — 80 77.0 62.2 60.4 20 — 80 80.0 70.1 68.4 Good tablet flow, no sticking 30 — 80 80.1 72.5 70.6 Good tablet flow, no sticking 35 0 80 79.9 73.6 72.0 Start of curing; good tablet flow, no sticking 38 3 — — — 72.7 Maximum exhaust temp 40 5 74 73.5 71.8 72.3 45 10 74 73.9 71.9 72.3 Good tablet flow, no sticking 50 15 74 to 22 74.2 72.0 72.4 End of curing, start cooling 71 — 22 21.7 28.4 30.0 End cooling, no sticking observed during cool down, good tablet flow, take cured tablet sample ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 15.2.2 Example 15.2 15 min Uncured cure Coated (n = 25) (n = 5) (n = 5) Tablet Weight (mg) 254 250  257  Dimensions Thickness (mm) 4.20    4.28    4.29 Breaking strength (N) 92 196 ¹ 194 ² n = 3 n = 3 n = 6 Dissolution 1 hr 26 28 25 (% Released) 2 hr 43 42 39 SGF 4 hr 65 67 64 6 hr 83 83 82 8 hr 92 94 92 12 hr  101 102  100  16 hr  104 103  102  ¹ maximum force of the hardness tester, the tablets did not break when subjected to the maximum force of 196 N. ² Four of the tablets did not break when subjected to the maximum force of 196 N, one tablet provided a breaking strength of 185 N (average of sample, n = 5, 194 N).

Example 16

In Example 16, two different Oxycodone HCl tablet formulations were prepared using high molecular weight polyethylene oxide. One formulation at 234 mg tablet weight (Example 16.1) with 60 mg of Oxycodone HCl and one formulation at 260 mg tablet weight (Example 16.2) with 80 mg of Oxycodone HCl. The formulations manufactured at a larger batch size compared to Example 15.

Compositions:

Example 16.1 Example 16.2 mg/unit mg/unit Ingredient Oxycodone HCl 60 80 Polyethylene oxide (MW: 162.75 167.5 approximately 4,000,000; Polyox ™ WSR- 301, LEO) Magnesium Stearate 2.25 2.50 Total Core Tablet Weight (mg) 225 250 Total Batch size 100 kg 100 kg Coating Opadry film coating 9 10 Total Tablet Weight (mg) 234 260 Coating Batch Size (kg) 94.122 93.530 The processing steps to manufacture tablets were as follows:

-   1. The Oxycodone HCl and magnesium stearate were passed through a     Sweco Sifter equipped with a 20 mesh screen, into separate suitable     containers. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   Remaining polyethylene oxide WSR 301 -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. Magnesium stearate was charged into the Gemco “V” blender. -   5. Step 4 materials were blended for 2 minutes with the I bar off. -   6. Step 5 blend was charged into clean, tared, stainless steel     containers. -   7. Step 6 blend was compressed to target weight on a 40 station     tablet press at 135,000 tph speed using ⅜ inch standard round,     concave embossed tooling, and a compression force of 16.5 kN for     Example 16.1 and a compression force of 16.0 kN for Example 16.2. A     sample of core tablets was taken. -   8. Step 7 tablets were loaded into a 48 inch Accela-Coat coating pan     at a load of 94.122 kg (Example 16.1) and 93.530 kg (Example 16.2). -   9. The pan speed was set to 7 rpm and the tablet bed was heated by     setting the exhaust air temperature to achieve an exhaust     temperature of 72° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature achieved 72° C.     The tablets were cured at the target exhaust temperature for 15     minutes. The temperature profile of the curing processes of Examples     16.1 and 16.2 is presented in Tables 16.1.1 and 16.2.1. -   10. The pan speed was continued at 7 rpm. The exhaust temperature     was set to 25° C. and the tablet bed was cooled until an exhaust     temperature of 30° C. was achieved. -   11. The tablet bed was warmed using an exhaust setting of 30° to     38° C. The filmcoating was started once the exhaust temperature     achieved 40° C. and continued until the target weight gain of 4% was     achieved. The pan speed was maintained at 7 rpm during filmcoating. -   12. After filmcoating was completed, the pan speed was reduced to     1.5 rpm and the exhaust temperature was set to 27° C., the airflow     was maintained at the current setting and the tablet bed cooled to     an exhaust temperature of <30° C. -   13. The tablets were discharged.

In vitro testing including breaking strength tests was performed as follows:

Coated tablets were tested in vitro using USP Apparatus 1 (basket with a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 8.0, and 12.0 hours.

Uncured tablets were subjected to weight, thickness and hardness tests on-line by Key Checkweigher.

Tablet dimensions and dissolution results are presented in Tables 16.1.2 to 16.2.2.

TABLE 16.1.1 Temperature profile of the curing process for Ex. 16.1 Total Curing Temperature Time time Inlet IR gun Exhaust set Exhaust (min.) (min.)¹ (° C.) ² (° C.)³ (° C.) (° C.)⁴ Comments 0 — 34 32 65 24 Start heating 5 — 82 54 65 49 10 — 89 68 65 63 11 — — — 72 — 15 — 91 71 72 67 20 — 91 75 72 70 21 0 92 79 72 72 Start curing 26 5 90 85 70 79 30 9 63 — — — 31 10 69 74 72 69 36 15 80 78 72 72 37 16 80 77 72 to 25 73 End of curing, good tablet flow, no sticking, start cooling 42 — 31 57 25 54 47 — 25 50 25 49 52 — 22 36 25 36 57 — 22 26 25 29 End cooling, no sticking observed during cool down, good tablet flow ¹determined according to method 2, ² temperature measured at the inlet, ³temperature measured using an IR gun ⁴temperature measured at the exhaust.

TABLE 16.1.2 Example 16.1 Uncured (n = 70) Coated Tablet Weight (mg) 224.6 — Dimensions Thickness (mm) 3.77 — Breaking strength (Kp) 5.7 — n = 6 Dissolution 1 hr — 24 (% Released) 2 hr — 41 SGF 4 hr — 67 8 hr — 93 12 hr  — 99

TABLE 16.2.1 Temperature profile of the curing process for Ex. 16.2 Total Curing Temperature Time time Inlet IR gun Exhaust set Exhaust (min.) (min.)¹ (° C.) ² (° C.)³ (° C.) (° C.)⁴ Comments 0 — 26 22 20 23 2 — — — 20 to 65 — Start heating 7 — 84 61 65 56 12 — 89 69 65 65 13.5 — 90 — 66 66 14.5 — 89 — 67 67 16.5 — — — 68 67 17 — 90 72 68 68 19 — 91 73 68 69 20 — 91 — 68 70 21 — — — 68 71 22 0 91 77 68 72 Start curing 24 2 90 81 70 75 24.5 2.5 — — 70 76 25 3 90 — 72 77 26 4 90 — 72 78 27.5 5.5 — — 72 79 28 6 82 83 72 78 Good tablet flow, no sticking 32 10 65 73 72 69 33 11 — — — 68 35 13 79 74 72 70 37 15 81 76 72 to 25 72 End of curing, good tablet flow, no sticking, start cooling 42 — 32 56 25 54 47 — 25 50 25 48 good tablet flow, no sticking 52 — 22 36 25 36 56 — 21 29 25 30 End cooling, no sticking observed during cool down, good tablet flow ¹determined according to method 2, ² temperature measured at the inlet, ³temperature measured using an IR gun ⁴temperature measured at the exhaust.

TABLE 16.2.2 Example 16.2 Uncured (n = 60) Coated Tablet Weight (mg) 250.8 — Dimensions Thickness (mm) 4.05 — Breaking strength (Kp) 6.8 — n = 6 Dissolution 1 hr — 22 (% Released) 2 hr — 37 SGF 4 hr — 62 8 hr — 89 12 hr  — 97

Example 17

In Example 17, two Oxycodone HCl tablet formulations containing 60 mg of Oxycodone HCl were prepared using high molecular weight polyethylene oxide. Example 17.1 is the same formulation as presented in Example 15.1. The second formulation (Example 17.2) contains 0.1% of butylated hydroxytoluene. Each tablet formulation was cured at the target exhaust temperature of 72° C. and 75° C. for 15 minutes, followed by filmcoating, and then an additional curing step at the target exhaust temperature for 30 minutes.

Compositions:

Example 17.1 Example 17.2 mg/unit mg/unit Ingredient Oxycodone HCl 60 60 Polyethylene oxide (MW: 162.75 162.525 approximately 4,000,000; Polyox ™ WSR- 301) Butylated Hydroxytoluene (BHT) 0 0.225 Magnesium Stearate 2.25 2.25 Total Core Tablet Weight (mg) 225 225 Total Batch size 5 kg 10 kg Coating Opadry film coating 9 9 Total Tablet Weight (mg) 234 234 Coating Batch Size (kg) 2 kg at 72° C. 6 kg at 72° C 2 kg at 75° C 2 kg at 75° C The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—16 quart was charged     in the following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride (screened through a 20-mesh screen)     -   Remaining polyethylene oxide WSR 301 -   2. Step 1 materials were blended for 5 minutes with the I bar on. -   3. Magnesium stearate was charged into the “V” blender. -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag (note: two 5 kg     blends were prepared for Example 17.2 to provide 10 kgs of tablet     blend for compression). -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press at 30,000 tph speed using ⅜ inch standard round,     concave (embossed) tooling. Example 17.1 was compressed at a     compression force at 12 kN and Example 17.2 at 6 kN, 12 kN and 18     kN. -   7. Step 6 tablets were loaded into a 15 inch (for 2 kg batch size)     or a 24 inch (for 6 kg batch size) Accela-Coat coating pan. -   8. A temperature probe (wire thermocouple) was placed into the pan     directly above the tablet bed so that the probe tip was near the     cascading bed of tablets. -   9. The pan speed was set at 7 or 10 rpm and the tablet bed was     heated by setting the inlet temperature to achieve an exhaust target     temperature of 72° C. or 75° C. The curing starting point (as     described by method 2) was initiated once the exhaust temperature     achieved target. The inlet temperature was adjusted as necessary to     maintain the target exhaust temperature. The tablets were cured for     15 minutes. The pan speed was maintained at the current rpm. The     temperature profile of the curing processes for Examples 17.1 and     17.2 is presented in Tables 17.1.1 and 17.2.1. -   10. The pan speed was continued at the current rpm. The inlet     temperature was set to 20° or 22° C. and the tablet bed was cooled     until an exhaust temperature of approximately 30° C. was achieved.     NOTE: Magnesium Stearate was not used. -   11. The tablet bed was warmed using an inlet setting of 52°-54° C.     The filmcoating was started once the exhaust temperature achieved     approximately 39°-42° C. and continued until the target weight gain     of 4% was achieved. The pan speed was increased to 15 or 20 rpm     during filmcoating. -   12. After filmcoating was completed, the pan speed was reduced to     the level used during curing. The tablet bed was heated by setting     the inlet temperature to achieve the exhaust target temperature of     72° C. or 75° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature achieved     target. The inlet temperature was adjusted as necessary to maintain     the target exhaust temperature. The coated tablets were cured for an     additional 30 minutes. The pan speed was maintained at the current     rpm. The temperature profile of the additional curing process for     Examples 17.1 and 17.2 is presented in Tables 17.1.1 and 17.2.1. -   13. The tablets were discharged.

In vitro testing including breaking strength tests was performed as follows:

Core tablets (uncured), cured tablets and cured/coated tablets were tested in vitro using USP Apparatus 1 (basket with a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 6.0, 8.0, 12.0 and 16.0 hours.

Uncured tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 apparatus to evaluate tablet resistance to breaking.

Tablet dimensions and dissolution results are presented in Tables 17.1.2 to 17.2.2.

TABLE 17.1.1 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments Curing process at 72° C. for Example 17.1 0 — 22 to 80 25.5 28.4 28.5 Start heating 10 — 80 80.2 69.6 68.1 19 0 80 to 78 80.0 73.2 72.0 Start of curing 24 5 78 77.9 73.2 73.0 29 10 75 75.0 71.8 72.3 34 15 75 75.0 72.3 72.0 End of curing, start cooling 50 — 22 22.8 28.2 29.2 End cooling, ready to coat Apply 4% filmcoat to the tablets, once achieved start heating 0 — 48 to 80 47.8 45.1 43.1 Start heating for additional curing 5 — 80 80.0 68.7 64.9 13 0 80 to 76 80.1 73.2 72.0 Start additional curing 28 15 75 74.9 72.0 72.4 15 minute additional curing 43 30 74 to 22 74.0 71.5 72.1 30 minute additional curing, start cooling 55 — 22 24.6 32.2 34 End cooling, discharge Curing process at 75° C. for Example 17.1 0 — 42 to 80 42.1 38.6 38.5 Start heating 18 — 80 to 83 80.1 73.0 72.4 21 0 82 81.5 75.1 75.0 Start of curing 26 5 77 76.6 73.5 74.7 31 10 77.5 77.4 73.8 75.0 36 15 77.5 to 22   77.6 74.1 75.2 End of curing, start cooling 53 — 22 23.1 29.5 29.6 End cooling, ready to coat Apply 4% filmcoat to the tablets, once achieved start heating 0 — 48 to 83 48.1 44.4 41.5 Start heating for additional curing 12 0 83 83.1 75.1 75.0 Start additional curing 27 15 78 78.11 74.4 75.4 15 minute additional curing 42 30 76.5 to 22   76.5 73.9 74.9 30 minute additional curing, start cooling 56 — 22 23.9 30.3 30.0 End cooling, discharge ¹determined according to method 2, ²temperature measured at the inlet, ³ temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 17.1.2 Example 17.1 Uncured (n = 25) Tablet Weight (mg) 225 — — Dimensions Thickness (mm) 3.86 — — Breaking strength (N) 75 — — Example 17.1 Example 17.1 cured at 72° C cured at 75° C 15 min 15 min cure Coated cure Coated n = 3 n = 3 n = 6 n = 3 n = 3 Dissolution 1 hr 27 27 26 28 26 (% Released) 2 hr 44 42 41 44 42 SGF 4 hr 68 67 66 69 67 6 hr 83 83 84 85 83 8 hr 93 92 93 95 93 12 hr  99 100 100 100 98 16 hr  100 102 102 102 99

TABLE 17.2.1 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments Curing process at 72° C. for Example 17.2 0 — 80 34.8 33.8 32.1 Pan load 6 kg; start heating 10 — 80 76.5 64.5 63.3 20 — 80 80.1 71.1 69.9 27.5 0 80 80.3 73.0 72.0 Start of curing 32.5 5 73.0 73.3 71.0 73.3 37.5 10 72.5 72.7 70.2 71.8 42.5 15 73.6 to 22   73.5 70.6 72.1 End of curing, start cooling 61 — 22 22.7 30.1 30 End cooling, ready to coat Apply 4% filmcoat to the tablets, once achieved start heating 0 — 80 to 53 53 — 39.5 Start heating for additional curing 15 — 80 79.9 72.3 69.7 18 0 80 79.9 74.1 72.0 Start additional curing 33 15 73.5 73.4 70.9 72.3 15 minute additional curing 48 30 73.5 73.5 71.4 72.5 30 minute additional curing, start cooling 64 — 23.0 23.9 — 30.0 End cooling, discharge Curing process at 75° C. for Example 17.2 0 — 82 52.9 53 48.4 Pan load 2 kg, start heating 12 — 82 82.2 75.4 72.8 16 — 82 to 85 72.6 70.0 69.7 23.5 0 85 to 82 81.8 76.4 75.0 Start of curing 26.5 3 82 to 80 81.8 77.2 77.0 32 8.5 78 80.1 76.8 77.1 38.5 15 78 78 75.6 76.1 End of curing, start cooling 53 — 20 32.4 30.0 32.1 End cooling, ready to coat Apply 4% filmcoat to the tablets, once achieved start heating 0 — 53.5 to 83   53.7 — 46.5 Start heating for additional curing — 0 83 83 73.7 75 Start additional curing — 15 78 77.9 74.3 75.9 15 minute additional curing — 23 78 78 75.1 76.3 — 30 78 to 22 78 75.1 76.4 30 minute additional curing, start cooling — — 22 23.6 31.0 32.1 End cooling (15 minutes of cooling), discharge ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 17.2.2 Example 17.2 Uncured core tablets (n = 5) Compression force (kN) 6 12 18 12 Tablet Weight (mg) 226 227 227 226 Dimensions Thickness (mm) 3.93 3.87 3.86 3.91 Breaking strength (N) 43 71 83 72 Example 17.2 cured at 75° C Example 17.2 cured at (2 kg batch) 72° C. (6 kg batch) Uncured 15 min 15 min cure, coated (core) cure Coated Compression force (kN) 6 12 18 12 n = 3 n = 3 n = 3 n = 3 n = 3 n = 3 Dissolution 1 hr 25 23 23 26 27 24 (% Released) 2 hr 41 39 37 41 43 40 SGF 4 hr 65 64 59 64 66 64 No spring 6 hr 80 81 75 79 81 80 8 hr 90 91 86 88 91 90 12 hr  98 100 97 99 101 100 Dissolution 1 hr 26 24 (% Released) 2 hr 42 40 SGF 4 hr 66 66 Basket with 6 hr 83 83 spring 8 hr 93 92 12 hr  100 98 16 nr  102 101

Example 18

In Example 18, four different Oxycodone HCl tablet formulations containing 80 mg of Oxycodone HCl were prepared using high molecular weight polyethylene oxide at a tablet weight of 250 mg. Two of the formulations (Examples 18.2 and 18.3) contained 0.1% of butylated hydroxytoluene. One of the formulations (Example 18.4) contained 0.5% of butylated hydroxytoluene. Three of the formulations (Examples 18.1, 18.2, and 18.4) contained 1% of magnesium stearate. One of the formulations (Example 18.3) contained 0.5% of magnesium stearate.

Compositions:

Example Example Example Example 18.1 18.2 18.3 18.4 mg/unit mg/unit mg/unit mg/unit Ingredient Oxycodone HCl 80 (32%) 80 (32%) 80 (32%) 80 (32%) Polyethylene oxide (MW: 167.5 (67%) 167.25 (66.9%) 166.25 (67.4%) 166.25 (66.5%) approximately 4,000,000; Polyox ™ WSR- 301) Butylated Hydroxytoluene (BHT)  0 0.25 (0.1%) 0.25 (0.1%) 1.25 (0.5%) Magnesium Stearate 2.5 (1%) 2.5 (1%) 1.25 (0.5%) 2.5 (1%) Total Core Tablet Weight (mg) 250 250 250 250 Total Batch size (kg) 5 and 6.3 5 5  5 Coating Opadry film coating n/a 7.5 10 n/a Total Tablet Weight (mg) n/a 257.5 260 n/a Coating Batch size (kg) n/a 1.975 2.0 n/a The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—16 quart was charged     in the following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   BHT (if required)     -   Remaining polyethylene oxide WSR 301 -   2. Step 1 materials were blended for 10 minutes (Example 18.1, 6.3     kg batch size), 6 minutes (Example 18.2), or 5 minutes (Example     18.1, 5 kg batch size, Example 18.3 and 18.4) with the I bar on. -   3. Magnesium stearate was charged into the “V” blender. -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag. -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press. The compression parameters are presented in Tables     18.1 to 18.4. -   7. Step 6 tablets were loaded into an 18 inch Compu-Lab coating pan     at a pan load of 1.5 kg (Example 18.1 cured at 72° C.), 2.0 kg     (Example 18.1 cured at 75° and 78° C.), 1.975 kg (Example 18.2 cured     at 72° C. and 75° C.), 2.0 kg (Example 18.3), 2.0 kg (Example 18.4     cured at 72° C. and 75° C.). -   8. A temperature probe (wire thermocouple) was placed into the pan     directly above the tablet bed so that the probe tip was near the     moving bed of tablets. -   9. For Examples 18.1 to 18.4, the tablet bed was heated by setting     the inlet temperature to achieve an target exhaust temperature of     72° C., 75° C. or 78° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature reached the     target exhaust temperature. Once the target exhaust temperature was     achieved, the inlet temperature was adjusted as necessary to     maintain the target exhaust temperature. The tablets were cured for     durations of 15 minutes up to 90 minutes. After curing, the tablet     bed was cooled. The temperature profiles for the curing processes     for Examples 18.1 to 18.4 are presented in Tables 18.1.1 to 18.4.1. -   10. After cooling, the tablet bed was warmed using an inlet setting     of 53° C. (Examples 18.2 and 18.3, for Examples 18.1 and 18.4 film     coating was not performed). The film coating was started once the     exhaust temperature achieved approximately 40° C. and continued     until the target weight gain of 3% (Example 18.2) and 4% (Example     18.3) was achieved. -   11. After film coating was completed (Example 18.2), the tablet bed     was heated by setting the inlet temperature to achieve the exhaust     target temperature (72° C. for one batch and 75° C. for one batch).     The curing starting point (as described by method 2) was initiated     once the exhaust temperature reached the target exhaust temperature.     Once the target exhaust temperature was achieved, the inlet     temperature was adjusted as necessary to maintain the target exhaust     temperature. The film coated tablets were cured for an additional 30     minutes. After the additional curing, the tablet bed was cooled. The     temperature profile for the curing process for Example 18.2 is     presented in Table 18.2.1. -   12. The pan speed was reduced and the inlet temperature was set to     22° C. The system cooled to an exhaust temperature of 30° C. -   13. The tablets were discharged.

In vitro testing including breaking strength tests and stability tests was performed as follows:

Core tablets (uncured), cured tablets, and cured/coated tablets were tested in vitro using USP Apparatus 1 (some testing included basket with a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 230 nm UV detection. Sample time points included 1.0, 2.0, 4.0, 6.0, 8.0, and 12.0 hours.

Uncured tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 apparatus to evaluate tablet resistance to breaking.

Example 18.4 tablets (cured at 72° C. and 75° C. respectively) were subjected to a stability test by storing them in 6 count bottles at different storage conditions (25° C./60% relative humidity or 40° C./75% relative humidity or 50° C.) for a certain period of time and subsequently testing the tablets in vitro as described above. Sample time points regarding storage include initial sample (i.e. prior to storage), two weeks and one month, sample time points regarding dissolution test include 1.0, 2.0, 4.0, 6.0, 8.0 and 12.0 hours.

Tablet dimensions and dissolution results are presented in Tables 18.2.2 to 18.4.2.

TABLE 18.1.1 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments Curing process at 72° C. for Example 18.1 0 — 23 to 80 24.8 28.4 28.9 Pan load 1.5 kg; start heating 10 — 80 76.4 65.5 65.2 15 — 80 79.9 70.8 70.3 20 0 80 to 78 80.0 72.3 72.0 Start of curing 25 5 78 to 75 76.6 71.9 72.9 35 15 75 75 71.4 72.0 Sample 40 20 75 75.1 71.7 72.5 50 30 75 74.9 72.0 72.7 Sample 60 40 74 73.9 71.4 72.2 65 45 74 74 71.5 72.1 Sample 80 60 74 74 71.2 71.8 Sample 95 75 74 73.9 71.7 72.3 Sample 110 90 74 to 22 74 71.7 72.3 End of curing, take sample, add 0.3 g of magnesium stearate, start cooling 129 — 22 23.1 27.4 26.9 End cooling, no sticking during cool down, discharge Curing process at 75° C. for Example 18.1 0 — 23 to 85 24.1 25.0 24.9 Pan load 2.0 kg, start heating 10 — 85 79.6 67.4 66.5 15 — 85 85 73.8 72.3 19 0 85 to 82 85.1 76.2 75 Start of curing 22 3 82 to 80 80.5 75.3 76.2 29 10 78 78 74.2 75.1 34 15 78 78.2 73.6 75.1 Sample 49 30 78 77.8 74.5 75.5 Sample 59 40 77.5 77.6 74.66 75.4 64 45 77.5 77.6 74.8 75.4 Sample 79 60 77.5 77.6 74.6 75.1 Sample 94 75 77.5 77.5 74.5 75.1 Sample, minor sticking 109 90 77.5 77.6 75.0 75.6 End of curing, take sample, start cooling 116 — 22 30.6 42.6 46.7 Minor sticking at support arms 122 — 22 25 — 33.5 End cooling Curing process at 78° C. for Example 18.1 0 — 82 35 37.6 35.9 Pan load 2 kg, start heating 7 — 85 84.9 71.3 69.8 14 — 85 84.9 75.9 75.0 17.5 0 85 to 83 85.1 77.4 78.0 Start of curing 22.5 5 83 83.2 77.5 78.6 32.5 15 82 81.9 76.9 78.4 Sample 47.5 30 81 80.9 77.4 78.3 Sample 57.5 40 80.5 80.6 77.5 78.1 62.5 45 80.5 80.7 77.4 78.2 Sample 69.5 52 80.5 80.4 77.5 78.2 Minor sticking 77.5 60 80.5 80.6 77.6 78.3 Sample, sticking 87.5 70 — — — — Add 0.3 g of magnesium stearate 92.5 75 80.0 79.8 77.1 78.1 Sample, sticking continued, brief improvement of tablet flow with magnesium stearate addition 107.5 90 80.0 79.9 77.5 78.0 Sample, start cooling ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 18.1.2 Example 18.1 (6.3 kg batch) Uncured core tablets n = 12 Compression force (kN) 15 Tablet Weight (mg) 250 Dimensions Thickness (mm) 4.08 Breaking strength (N) 87 Example 18.1 cured at 72° C. uncured 15 min cure 60 min cure n = 3 n = 3 n = 2 Dissolution 1 hr 25 26 25 (% Released) 2 hr 40 40 40 SGF 4 hr 66 64 62 No spring 8 hr 95 89 91 12 hr  102 97 92 Example 18.1 (5.0 kg batch) Uncured core tablets n = 25 Compression force (kN) 15 Tablet Weight (mg) 253 Dimensions Thickness (mm) 4.13 Breaking strength (N) 92 Example 18.1 Example 18.1 cured at 75° C. cured at 78° C 15 min 60 min 30 min uncured cure cure cure n = 3 n = 3 n = 3 n = 3 Dissolution 1 hr 26 26 26 26 (% Released) 2 hr 40 41 42 41 SGF 4 hr 63 67 68 66 No spring 8 hr 90 94 94 93 12 hr  101 101 100 101

TABLE 18.2.1 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments Curing process at 72° C. for Example 18.2 0 — 42 to 80 41.9 37.4 37.8 Pan load 1.975 kg, start heating 10 — 80 80.0 68.0 68.6 18 0 80 80.1 71.6 72.0 Start of curing 28 10 75 74.5 70.7 72.4 33 15 75 to 22 75.0 71.1 72.3 End of curing, start cooling 47.5 — 22 22.5 30.4 30.0 End cooling, sample, ready to coat Apply 3% filmcoat to the tablets, once achieved start heating 0 — 50 to 80 50 48.0 43.0 Start heating for additional curing 12 0 80 to 77 80.0 72.1 72.0 Start additional curing 27 15 75 74.9 71.0 72.4 Sample 15 minute additional curing 42 30 74 to 22 73.9 70.7 72.1 Sample, 30 minute additional curing, start cooling 61 — 22 — — 30 End cooling, discharge, sample Curing process at 75° C. for Example 18.2 0 — 42 to 82 41.8 39.7 40.1 Pan load 1.975 kg, start heating 13 — 82 82 73.0 72.2 18 0 82 to 80 81.9 75.2 75.0 Start of curing 33 15 78 to 22 77.8 74.2 75.4 End of curing, start cooling, no sticking 49 — 22 22.5 28.8 29.5 End cooling, sample, ready to coat Apply 3% filmcoat to the tablets, once achieved start heating 0 — 48 to 83 48.0 44.5 41.5 Start heating for additional curing 13 0 83 83.3 75.6 75.4 Start additional curing 28 15 78 78.0 74.6 75.4 Sample 15 minute additional curing 44.5 31.5 77.5 to 22   77.4 74.4 75.4 Sample 30 minute additional curing, start cooling 58.5 — 22 24.2 — 30 End cooling, discharge, sample ¹ determined according to method 2, ² temperature measured at the inlet, ³ temperature measured using the temperature probe (wire thermocouple) ⁴ temperature measured at the exhaust.

TABLE 18.2.2 Example 18.2 Uncured core tablets n = 10 n = 10 n = 10 Tooling size, round (in) ⅜ ⅜ 13/32 Compression force (kN) 8 15 15 Tablet Weight (mg) 253 253 252 Dimensions Thickness (mm) 4.24 4.21 3.77 Breaking strength (N) 50 68 55 Example 18.2 cured at 72° C. Compression force (kN) 8 15 15 15 min cure, 15 min cure, 15 min cure, coated coated coated n = 3 n = 6 n = 3 n = 6 n = 3 Dissolution No With No With No With Basket * spring spring spring spring spring spring Dissolution¹ 1 hr 22 (4.9) 23 (6.5) 22 (4.8) 24 (5.6) 23 (2.2) (% Released) 2 hr 36 (6.1) 38 (5.4) 36 (6.7) 39 (4.4) 37 (3.9) SGF 4 hr 58 (5.8) 63 (2.3) 58 (7.0) 63 (2.3) 59 (5.2) 6 hr 75 (4.9) 80 (1.2) 75 (4.9) 80 (1.6) 76 (4.2) 8 hr 87 (4.1) 90 (1.2) 88 (3.1) 90 (1.8) 88 (3.2) 12 hr  96 (1.9) 99 (0.8) 97 (1.2) 98 (1.6) 97 (1.1) 16 hr  — 100 (1.4)  — 101 (2.8)  — * Some testing included the use of a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft; ¹the values in parantheses indicate relative standard deviation.

TABLE 18.3.1 Curing process at 72° C. for Example 18.3 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 22 to 80 25.1 29.4 30.1 Pan load 2.0 kg, start heating 10 — 80 80.2 68.3 68.0 19 0 80 80.0 71.8 72.0 Start of curing 24 5 76 75.7 71.2 72.5 29 10 76 to 75 76.0 71.3 72.7 34 15 75 to 22 74.9 70.7 72.2 End of curing, start cooling 49 — 22 22.9 29.1 29.7 End cooling ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 18.3.2 Example 18.3 Uncured core tablets Tooling Round ⅜ inch Oval 0.600 × 0.270 inch Compression 15 10-11 force (kN) n = 5 n = 5 Tablet Weight (mg) 250 250 Dimensions Thickness (mm) 4.20 3.80-3.84 Breaking strength 83-110 71-76 (N) Example 18.3 cured at 72° C. 15 min cure, coated 15 min cure, coated Round ⅜ inch Oval 0.600 × 0.270 inch n = 6 n = 6 n = 6 Dissolution No With No Basket * spring spring spring Dissolution ¹ 1 hr 23 (7.0) 23 (4.9) 24 (7.2) (% Released) 2 hr 37 (6.2) 38 (3.4) 40 (6.0) SGF 4 hr 59 (4.6) 61 (1.9) 64 (5.0) 6 hr 75 (3.5) 79 (1.5) 81 (2.8) 8 hr 87 (2.7) 89 (2.1) 91 (2.0) 12 hr  98 (2.6) 98 (2.6) 98 (1.6) * Some testing included the use of a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft. ¹ the values in parantheses indicate relative standard deviation.

TABLE 18.4.1 Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments Curing process at 72° C. for Example 18.4 0 — 82 35.6 37.3 36.3 Pan load 2.0 kg; start heating 8 — 82 82 69.8 68.8 13.5  0 82 82 72.6 72.0 Start of curing 18.5  5 80 to 79 79.6 72.0 73.5 23.5 10 76 75.9 71.4 73.0 28.5 15 75 75 70.9 72.4 Sample 38.5 25 75 74.9 70.9 72.5 43.5 30 75 75 71.1 72.6 Sample 51.5 38 75 75.1 71.4 72.7 58.5 45 75 75 71.4 72.8 Sample 68.5 55 75 75.2 71.6 73.0 73.5 60 75 75 71.5 73 End of curing, sample, start cooling 78.5 — 23 37.4 48 52.2 Continue cooling Curing process at 75° C. for Example 18.4 0 — 85 26.1 31.0 29.1 Pan load 2.0 kg, start heating 5 — 82 73.8 61.9 61.1 11 — 82 79.9 69.3 68.3 17.5  0 85 85 76.2 75 Start of curing 27.5 10 78 77.8 74.4 76.1 32.5 15 78 77.9 74.5 75.9 Sample 39.5 22 77.55 77.4 74.1 75.6 47.5 30 77.5 77.4 74.2 75.6 Sample 55.5 38 77 76.9 74.0 75.4 62.5 45 77 77 73.9 75.3 Sample 69.5 52 77 77.2 73.8 75.3 77.5 60 77 77.0 73.7 75.3 End of curing, sample, start cooling ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 18.4.2 Example 18.4 Uncured core tablets n = 25 Compression force (kN) 15 Tablet Weight (mg) 254 Dimensions Thickness (mm) 4.15 Breaking strength (N) 85 Example 18.4 Example 18.4 cured at 72° C. cured at 75° C. 15 min 60 min 15 min 60 min uncured cure cure cure cure n = 3 n = 3 n = 3 n = 3 n = 3 Dissolution 1 hr 26 26 26 26 25 (% Released) 2 hr 41 41 41 42 40 SGF 4 hr 63 64 65 65 64 No spring 8 hr 89 89 94 91 89 12 hr  98 99 100 100 99 Example 18.4, 2 week stability 15 min cure at 72° C. initial 25/60¹ 40/75¹ 50° C. n = 3 n = 4 n = 4 n = 4 Dissolution 1 hr 26 26 26 27 (% Released) 2 hr 41 40 41 42 SGF 4 hr 64 62 63 65 No spring 6 hr — — — — 8 hr 89 88 90 92 12 hr  99 99 99 102  Example 18.4, 2 week stability 15 min cure at 75° C. initial 25/60¹ 40/75¹ 50° C. n = 3 n = 4 n = 4 n = 4 Dissolution 1 hr 26 25 26 25 (% Released) 2 hr 42 39 41 40 SGF 4 hr 65 60 64 63 No spring 6 hr — — — — 8 hr 91 84 90 91 12 hr  100  95 99 99 Example 18.4 1 month stability 15 min cure at 72° C. initial 25/60¹ 40/75¹ 50° C n = 3 n = 4 n = 4 n = 3 Dissolution 1 hr 26 26 26 26 (% Released) 2 hr 41 41 40 41 SGF 4 hr 64 63 63 66 No spring 6 hr — 79 79 83 8 hr 89 89 91 93 12 hr  99 98 99 101  ¹storage conditions, i.e. 25° C./60% RH or 40° C./75% RH

Example 19

In Example 19, two different Oxycodone HCl tablet formulations containing 80 mg of Oxycodone HCl were prepared using high molecular weight polyethylene oxide at a tablet weight of 250 mg. One of the formulations (Example 19.1) contained Polyethylene oxide N60K and one formulation (Example 19.2) contained Polyethylene oxide N12K.

Compositions:

Example 19.1 Example 19.2 mg/unit mg/unit Ingredient Oxycodone HCl 80 (32%) 80 (32%) Polyethylene oxide (MW: 168.75 (67.5%) 0 approximately 2,000,000; Polyox ™ WSR- N60K) Polyethylene oxide (MW: 0 168.75 (67.5%) approximately 1,000,000; Polyox ™ WSR- N12K) Magnesium Stearate 1.25 (0.5%) 1.25 (0.5%) Total Core Tablet Weight (mg) 250 250 Total Batch size (kg) 2.0 2.0 Coating Opadry film coating 10 10 Total Tablet Weight (mg) 260 260 Coating Batch size (kg) 1.4 1.4 The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—8 quart was charged in     the following order:     -   Approximately ½ of the polyethylene oxide     -   Oxycodone hydrochloride     -   Remaining polyethylene oxide     -   Note: the polyethylene oxide was screened through a 20-mesh         screen, retain material was not used. -   2. Step 1 materials were blended for 5 minutes with the I bar on. -   3. Magnesium stearate was charged into the “V” blender. -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag. -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press at 30,000 tph speed using ⅜ inch standard round,     concave (embossed) tooling. The compression parameters are presented     in Tables 19.1 and 19.2. -   7. Step 6 tablets were loaded into an 18 inch Compu-Lab coating pan. -   8. A temperature probe (wire thermocouple) was placed into the pan     directly above the tablet bed so that the probe tip was near the     moving bed of tablets. -   9. The tablet bed was heated by setting the inlet temperature to     achieve an exhaust target temperature of 72° C. The curing starting     point (as described by method 2) was initiated once the exhaust     temperature reached the target temperature. Once the target exhaust     temperature was achieved, the inlet temperature was adjusted as     necessary to maintain the target exhaust temperature. The tablets     were cured for 15 minutes. After curing, the inlet temperature was     set to 22° C. and the tablet bed was cooled. The temperature     profiles for the curing processes for Examples 19.1 and 19.2 are     presented in Tables 19.1.1 and 19.2.1. -   10. After cooling, the tablet bed was warmed using an inlet setting     of 53° C. The film coating was started once the exhaust temperature     achieved approximately 41° C. and continued until the target weight     gain of 4% was achieved. -   11. After film coating was completed, the tablet bed was cooled by     setting the inlet temperature to 22° C. The tablet bed was cooled to     an exhaust temperature of 30° C. or less was achieved. -   12. The tablets were discharged.

In vitro testing including breaking strength tests was performed as follows:

Core tablets (uncured), cured tablets, and cured/coated tablets were tested in vitro using USP Apparatus 1 (basket with a retaining spring placed at the top of the basket to reduce the propensity of the tablet to stick to the base of the shaft) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 230 nm UV detection. Sample time points included 1.0, 2.0, 4.0, 6.0, 8.0, 12.0 and 16.0 hours.

Uncured tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 apparatus to evaluate tablet resistance to breaking.

Tablet dimensions and dissolution results are presented in Tables 19.1.2 and 19.2.2.

TABLE 19.1.1 Example 19.1 (PEO N60K) Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 22 to 80 25.3 26.4   26.9 Pan load 1.4 kg; start heating 21  0 80 79.9 70.0 * 72.0 Start of curing 31 10 75.5 75.5 69.1 * 72.2 Good tablet flow, no sticking 36 15 75.5 to 22   75.4 69.5 * 72.4 End of curing, start cooling 50 — 22 22.6 27.5   30.0 End of cooling, sample ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust; * Low temperature values compared to the exhaust temperature. Changed the battery prior to processing Example 19.2.

TABLE 19.1.2 Example 19.1 (PEG N60K) Uncured core tablets n = 15 Compression force (kN) 15 Tablet Weight (mg) 252 Dimensions Thickness (mm) 4.12 Breaking strength (N) 112 Example 19.1 cured at 72° C. uncured 15 min cure Cured/coated n = 3 n = 3 n = 6 Dissolution 1 hr 25 (2.3) 25 (2.1) 25 (3.7) (% Released) 2 hr 40 (1.8) 40 (1.3) 40 (3.8) SGF 4 hr 67 (0.7) 66 (1.5) 65 (1.4) Basket 6 hr 85 (1.0) 86 (3.9) 84 (1.0) with spring 8 hr 97 (0.8) 98 (1.8) 95 (0.7) 12 hr  101 (1.2)  103 (1.2)  102 (0.8)  16 hr  102 (0.7)  103 (2.0)  103 (1.1) 

TABLE 19.2.1 Example 19.2 (PEO N12K) Total Curing Temperature Time time Set inlet Actual inlet Probe Exhaust (min.) (min.)¹ (° C.) (° C.)² (° C.)³ (° C.)⁴ Comments 0 — 22 to 80 27.0 31.4 30.9 Pan load 1.4 kg; start heating 19.5 0 80 80.1 71.5 72.0 Start of curing 24.5 5 77 76.7 71.0 72.8 29.5 10 75 75.0 70.3 72.0 Good tablet flow, no sticking 34.5 15 75 to 22 75.1 70.4 72.0 End of curing, start cooling 49 — 22 22.4 30.0 30.0 End of cooling, sample ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured using the temperature probe (wire thermocouple) ⁴temperature measured at the exhaust.

TABLE 19.2.2 Example 19.1 (PEO N12K) Uncured core tablets n = 15 Compression force (kN) 15 Tablet Weight (mg) 257 Dimensions Thickness (mm) 4.17 Breaking strength (N) 107 Example 19.2 cured at 72° C uncured 15 min cure Cured/coated n = 3 n = 3 n = 6 Dissolution 1 hr 277 (7.6) 25 (1.0) 26 (4.0) (% Released) 2 hr  44 (4.9) 42 (0.6) 43 (3.7) SGF Basket 4 hr  72 (2.5) 70 (0.6) 71 (1.8) with spring 6 hr  92 (1.1) 92 (0.6) 91 (1.2) 8 hr 102 (0.9) 101 (1.1)  100 (1.4)  12 hr  102 (1.1) 101 (0.9)  101 (1.3)  16 hr  103 (0.3) 103 (1.3)  102 (1.1) 

Example 20: Indentation Test

In Example 20, tablets corresponding to Examples 13.1 to 13.5, 14.1 to 14.5, 16.1, 16.2, 17.1 and 18.2 were subjected to an indentation test with a Texture Analyzer to quantify the tablet strength.

The indentation tests were performed with a TA-XT2 Texture Analyzer (Texture Technologies Corp., 18 Fairview Road, Scarsdale, N.Y. 10583) equipped with a TA-8A ⅛ inch diameter stainless steel ball probe. The probe height was calibrated to 6 mm above a stainless stand with slightly concaved surface. The tablets were placed on top of the stainless stand and aligned directly under the probe. Each type of tablets was tested at least once. Single measurement values are reported. Testing performed on the same type of tablet produced similar results unless the tablet and the probe were misaligned. In such an event, the data would be rejected upon confirmation by visual examination of the tested tablet.

The indentation tests were run with the following parameters:

pre-test speed 0.5 mm/s, test speed 0.5 mm/s, automatic trigger force  10 grams, post-test speed 1.0 mm/s, test distance 3.0 mm.

The results are presented in Tables 20.1 to 20.3 and in FIGS. 20 to 33.

TABLE 20.1 Cracking force, “penetration depth to crack” distance and work values Indentation Test Results Cracking Maximum Force Force Distance Work (N) (N) ⁶ (mm) ⁷ (J) ⁸ Example 13.1¹ — 189 3.00 0.284 Example 13.2¹ — 188 3.00 0.282 Example 13.3¹ 191 — 2.91 0.278 Example 13.4¹ 132 — 1.81 0.119 Example 13.5¹ 167 — 1.82 0.152 Example 17.1² >250⁵  — >2.0 >0.250 Example 18.2² 194 — 1.80 0.175 Example 14.1³ 213 — 2.52 0.268 Example 14.2³ 196 — 2.27 0.222 Example 14.3³ 161 — 1.90 0.153 Example 14.4³ 137 — 1.51 0.103 Example 14.5³ 134 — 1.39 0.093 Example 16.1⁴ 227 — 2.23 0.253 Example 16.2⁴ 224 — 2.17 0.243 ¹indentation test performed with tablets cured for 30 min and uncoated (curing time determined according to method 4, curing started when the probe temperature reached 70° C., see Example 13). ²indentation test performed with tablets cured at 72° C. for 15 minutes and coated (curing time determined according to method 2, curing started when the exhaust air temperature reached 72° C., see Examples 17 and 18), ³indentation test performed with tablets cured for 1 hour and coated (curing time determined according to method 1, curing started when the inlet air temperature reached 75° C., see Example 14), ⁴indentation test performed with tablets cured for 15 minutes and coated (curing time determined according to method 2, curing started when the exhaust air temperature reached 72° C., see Example 16), ⁵The peak force exceeded the detection limit, ⁶ In the indentation tests where the tablets did not crack under the test conditions given above, the maximum force at penetration depth of 3.0 mm is given instead of a cracking force; ⁷ “penetration depth to crack” distance ⁸ approximated value, calculated using the equation: Work ≈½ · Force [N] × Distance [m].

TABLE 20.2 Selective force values at incremental distance change of 0.1 mm Distance Force (N) (mm) Ex. 13.1 Ex. 13.2 Ex. 13.3 Ex. 13.4 Ex. 13.5 Ex. 17.1 Ex. 18.2 0.0 0.18 0.18 0.15 0.17 0.24 0.14 0.35 0.1 3.54 4.86 3.67 4.38 5.35 6.12 6.88 0.2 8.76 10.56 9.95 10.29 12.37 15.13 15.51 0.3 15.49 16.97 16.85 17.62 22.22 25.57 25.33 0.4 22.85 24.19 23.81 25.44 32.98 35.86 35.21 0.5 30.43 31.59 30.81 33.42 43.85 46.10 45.25 0.6 37.80 38.82 38.42 41.49 55.41 56.87 55.60 0.7 45.61 46.10 46.61 49.73 67.02 67.69 66.85 0.8 53.30 53.08 54.53 58.37 78.43 78.71 78.24 0.9 60.67 60.25 62.38 67.00 89.60 90.74 89.60 1.0 68.02 67.55 70.89 75.45 100.38 103.18 101.69 1.1 75.29 74.67 80.12 83.75 110.46 116.10 114.50 1.2 82.81 81.40 89.03 91.14 119.87 129.90 127.13 1.3 90.04 88.23 97.49 98.35 129.16 144.28 139.46 1.4 96.85 95.21 105.89 105.88 138.29 158.94 151.41 1.5 103.92 101.84 114.37 112.94 146.76 173.41 162.88 1.6 111.30 108.30 122.31 119.59 154.61 188.13 173.95 1.7 118.27 115.16 129.99 125.85 161.87 202.39 184.52 1.8 125.02 121.81 136.94 131.63 167.65 216.08 193.31 1.9 131.71 128.37 143.45 137.30 165.05 229.06 190.80 2.0 138.09 134.64 149.56 142.86 163.03 241.23 191.16 2.1 144.38 140.46 155.52 148.05 165.82 250.17¹ 192.11 2.2 150.54 146.46 160.93 153.34 168.86 — 191.84 2.3 156.18 152.31 166.39 158.55 171.13 — 189.31 2.4 161.57 157.73 171.41 163.52 172.21 — 185.17 2.5 166.80 163.24 176.29 168.34 171.66 — 179.55 2.6 171.67 168.53 180.67 172.34 169.90 — 173.09 2.7 176.24 173.45 184.52 175.57 167.51 — 166.68 2.8 180.39 178.37 187.79 177.84 164.67 — 158.70 2.9 184.61 183.24 190.54 180.35 161.12 — 148.39 3.0 188.65 187.97 192.92 182.88 156.21 _(—) 137.65 ¹Force value at a distance of 2.0825 mm

TABLE 20.3 Selective force values at incremental distance change of 0.1 mm Dis- Force (N) tance Ex. Ex. Ex. Ex. Ex. Ex. Ex. (mm) 14.1 14.2 14.3 14.4 14.5 16.1 16.2 0.0 0.33 0.27 0.33 0.31 0.41 0.27 0.26 0.1 6.06 6.03 6.55 6.61 5.78 6.22 7.25 0.2 13.81 13.05 13.65 15.53 13.51 13.88 15.52 0.3 22.48 21.42 21.55 24.82 21.87 23.31 25.11 0.4 31.41 29.68 29.51 34.09 31.12 33.72 35.29 0.5 40.00 37.79 37.99 43.44 41.26 43.82 45.31 0.6 48.85 46.69 47.69 52.78 52.22 54.19 55.47 0.7 57.85 55.26 57.19 62.09 63.53 64.60 66.58 0.8 66.76 64.45 66.87 71.64 74.72 75.69 78.37 0.9 75.69 73.68 76.43 81.47 85.73 87.70 90.38 1.0 84.63 83.33 86.31 91.14 96.72 99.88 103.07 1.1 94.04 92.81 95.86 100.28 107.27 112.14 116.67 1.2 103.45 101.93 105.14 109.77 118.11 124.54 130.10 1.3 112.69 111.76 115.04 119.97 128.22 137.12 143.13 1.4 122.63 122.04 125.05 129.55 133.77 149.34 155.78 1.5 132.50 132.04 134.14 137.20 134.95 161.51 168.25 1.6 141.98 141.82 142.58 135.04 139.81 173.01 180.44 1.7 151.21 150.82 150.69 139.12 144.84 184.28 192.28 1.8 160.27 159.44 157.82 143.60 148.83 194.58 203.45 1.9 169.02 168.09 161.72 146.81 151.39 204.27 212.71 2.0 177.84 176.40 162.87 148.59 152.52 213.25 218.71 2.1 186.18 184.67 165.88 149.32 152.56 221.06 223.17 2.2 194.39 192.38 169.78 149.19 151.29 226.97 224.84 2.3 202.16 196.66 173.59 148.16 147.83 219.64 226.60 2.4 208.46 199.43 176.38 146.05 141.54 210.57 228.33 2.5 212.94 202.98 178.44 142.81 134.06 203.85 228.97 2.6 213.83 206.77 179.87 137.70 124.24 197.33 228.49 2.7 216.58 209.46 181.13 131.34 109.53 189.49 227.40 2.8 219.71 211.32 182.02 123.72 88.60 181.26 225.10 2.9 222.51 211.01 181.70 114.09 20.86 174.45 222.87 3.0 224.59 208.85 179.91 102.93 0.16 168.70 220.36

Example 21: Indentation Test

In Example 21, tablets corresponding to Examples 16.1 (60 mg Oxycodone HCl) and 16.2 (80 mg oxycodone HCL) and commercial Oxycontin™ 60 mg and Oxycontin™ 80 mg tablets were subjected to an indentation test with a Texture Analyzer to quantify the tablet strength.

The indentation tests were performed as described in Example 20.

The results are presented in Table 21 and in FIGS. 34 and 35.

TABLE 21 Selective force values at incremental distance change of 0.1 mm Force (N) Distance Oxycontin ™ Oxycontin ™ (mm) Ex. 16.1 60 mg Ex. 16.2 80 mg 0.0 0.27 0.42 0.26 0.42 0.1 6.22 14.14 7.25 14.21 0.2 13.88 30.39 15.52 29.75 0.3 23.31 46.53 25.11 44.30 0.4 33.72 61.94 35.29 59.46 0.5 43.82 78.14 45.31 75.33 0.6 54.19 13.58 55.47 91.91 0.7 64.60 0.30 66.58 108.71 0.8 75.69 0.09 78.37 1.48 0.9 87.70 0.00 90.38 1.52 1.0 99.88 0.01 103.07 1.17 1.1 112.14 0.01 116.67 1.31 1.2 124.54 0.00 130.10 3.61 1.3 137.12 0.01 143.13 7.85 1.4 149.34 0.00 155.78 3.49 1.5 161.51 0.00 168.25 0.15 1.6 173.01 0.00 180.44 0.85 1.7 184.28 0.00 192.28 1.46 1.8 194.58 0.00 203.45 1.12 1.9 204.27 0.00 212.71 0.81 2.0 213.25 0.02 218.71 0.52 2.1 221.06 −0.01 223.17 0.14 2.2 226.97 −0.01 224.84 0.13 2.3 219.64 −0.01 226.60 0.10 2.4 210.57 0.01 228.33 0.09 2.5 203.85 0.00 228.97 0.08 2.6 197.33 0.00 228.49 0.08 2.7 189.49 −0.01 227.40 0.07 2.8 181.26 0.00 225.10 0.08 2.9 174.45 0.00 222.87 0.07 3.0 168.70 0.00 220.36 0.08

Comparative Example 22

In Comparative Example 22, five different 150 mg tablets (Examples 22.1 to 22.5) including 10, 15, 20, 30 and 40 mg of oxycodone HCl were prepared using the compositions as described in Example 13, and amending the manufacturing process of Example 13 insofar that the tablets were subjected to a molding step instead of a curing step.

Compositions:

Exam- Exam- Exam- Exam- Exam- ple ple ple ple ple 22.1 22.2 22.3 22.4 22.5 Ingredient mg/unit mg/unit mg/unit mg/unit mg/unit Oxycodone HCl 10 15 20 30 40 Polyethylene oxide 138.5 133.5 128.5 118.5 108.5 (MW: approximately 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 1.5 1.5 1.5 1.5 1.5 Total Core Tablet 150 150 150 150 150 Weight (mg) Total Batch size 10 kg 10 kg 10 kg 10 kg 10 kg The processing steps to manufacture tablets were as follows:

-   1. A Patterson Kelly “V’ blender (with I bar)—16 quart was charged     in the following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   Remaining polyethylene oxide WSR 301 -   2. Step 1 materials were blended for 5 minutes with the I bar on. -   3. Magnesium stearate was charged into the “V” blender. -   4. Step 3 materials were blended for 1 minute with the I bar off. -   5. Step 4 blend was charged into a plastic bag. -   6. Step 5 blend was compressed to target weight on an 8 station     tablet press at 35,000 tph speed using 9/32 inch standard round,     concave (embossed) tooling. -   7. Step 6 tablets were molded with a temperature controlled Specac     press. The compressed tablets from step 6 were placed between two     heated plates which were preheated to 120° C. and then compressed at     a pressured setting of 1000 kg and held for 3 minutes. The molten     tablets were cooled to room temperature prior to density     measurement.

The density measurement was performed as follows:

The density of tablets before and after the molding step was determined by Archimedes principle, using a Top-loading Mettler Toledo balance Model # AB 135-S/FACT, Serial #1127430072 and a density determination kit 33360, according to the following procedure:

1. Set-up the Mettler Toledo balance with the Density Determination Kit. 2. Fill an appropriately sized beaker (200 ml) with hexane. 3. Weigh the tablet in air and record the weight as Weight A. 4. Transfer the same tablet onto the lower coil within the beaker filled with hexane. 5. Determine the weight of the tablet in hexane and record the weight as Weight B. 6. Perform the density calculation according to the equation

${\rho = {\frac{A}{A - B} \cdot \rho_{0}}},$

wherein

-   -   ρ: Density of the tablet     -   A: Weight of the tablet in air     -   B: Weight of the tablet when immersed in the liquid     -   ρ₀: Density of the liquid at a given temperature (density of         hexane at 20° C.=0.660 g/ml (Merck Index)         7. Record the density.         The reported density values are mean values of 3 tablets and all         refer to uncoated tablets.

The results are presented in Table 22.1.

TABLE 22.1 Density (g/cm³)¹ Density change after Unmolded tablet² Molded tablet molding (%)³ Example 22.1 1.172 1.213 +3.498 Example 22.2 1.174 1.213 +3.322 Example 22.3 1.179 1.222 +3.647 Example 22.4 1.182 1.231 +4.146 Example 22.5 1.222 1.237 +1.227 ¹The density value is a mean value of 3 tablets measured; ²The density of the “unmolded tablet” corresponds to the density of the “uncured tablet” of Examples 13.1 to 13.5; ³The density change after molding corresponds to the observed density change in % of the molded tablets in comparison to the unmolded tablets.

Example 23

In Example 23, 154.5 mg tablets including 30 mg Hydromorphone HCl were prepared using high molecular weight polyethylene oxide.

Composition:

mg/unit g/batch Ingredient Hydromorphone HCl 30 1000 Polyethylene oxide (MW: approximately 119.25 3975 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 0.75 25 Total Core Tablet Weight (mg) 150 Total Batch size 10 kg (2 × 5 kg) Coating Opadry film coating 4.5 Total Tablet Weight (mg) 154.5 Coating Batch Size (kg) 8.835 kg The processing steps to manufacture tablets were as follows:

-   1. A PK V-blender (with I-bar)—16 quart was charged in the following     order:     -   Approximately half of the Polyethylene Oxide 301     -   Hydromorphone HCl     -   Remaining Polyethylene Oxide 301 -   2. Step 1 materials were blended for 5 minutes with the intensifier     bar ON. -   3. Magnesium stearate was charged in the PK V-blender. -   4. Step 3 materials were blended for 1 minute with the intensifier     bar OFF. -   5. Step 4 blend was charged into a plastic bag (Note: two 5 kg     blends were produced to provide 10 kgs available for compression). -   6. Step 5 blend was compressed to target weight on an 8 station     rotary tablet press using 9/32 inch standard round, concave     (embossed) tooling at 35,000 to 40,800 tph speed using 5-8 kN     compression force. -   7. Step 6 tablets were loaded into a 24 inch Compu-Lab coating pan     at a pan load of 9.068 kg. -   8. The pan speed was set to 10 rpm and the tablet bed was heated by     setting the inlet air temperature to achieve an exhaust temperature     of approximately 72° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature achieved 72° C.     The tablets were cured at the target exhaust temperature for 1 hour.     Tablet samples were taken after 30 minutes of curing. -   9. After 1 hour of curing at the target exhaust temperature of 72°     C., the inlet temperature was set to 90° C. to increase the exhaust     temperature (the bed temperature). -   10. After 10 minutes of increased heating, the exhaust temperature     reached 82° C. The tablet continued to maintain good flow/bed     movement. No sticking was observed. -   11. The inlet temperature was set to 22° C. to initiate cooling.     During the cool down period (to an exhaust temperature of 42° C.),     no sticking or agglomerating of tablets was observed. -   12. Step 11 tablets were loaded into a 24 inch Compu-Lab coating pan     at a pan load of 8.835 kg. -   13. The tablet bed was warmed by setting the inlet air temperature     at 55° C. The film coating was started once the exhaust temperature     approached 42° C. and continued until the target weight gain of 3%     was achieved. -   14. Film coating was conducted at a spray rate of 40-45 g/min,     airflow target at 350 cfm, and pan speed initiated at 10 rpm and     increased to 15 rpm. After coating was completed the pan speed was     set to 3.5 rpm and the tablets were allowed to cool. -   15. The tablets were discharged.

In vitro testing including dissolution, assay and content uniformity test was performed as follows:

Tablets cured for 30 minutes (uncoated) were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 220 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 8.0 and 12.0 hours.

Tablets cured for 30 minutes (uncoated) were subjected to the assay test. Oxycodone hydrochloride was extracted from two sets of ten tablets each with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

Tablets cured for 30 minutes (uncoated) were subjected to the content uniformity test. Oxycodone hydrochloride was extracted from ten separate tablets each with 90 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 100-mL volumetric flask until the tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

The results are presented in Table 23.

TABLE 23 Example 23 30 min cure Assay 98.9 (% oxycodone HCl)¹ Content uniformity 97.9 (% oxycodone HCl)¹ Dissolution 1 hr 26 (% Released) 2 hr 42 (n = 6) 4 hr 66 8 hr 92 12 hr  101 ¹relative to the label claim of Oxycodone HCl

Example 24

In Example 24, 150 mg tablets including 2 mg Hydromorphone HCl were prepared using high molecular weight polyethylene oxide.

Composition:

Ingredient mg/unit g/batch Hydromorphone HCl 2 66.5 Polyethylene oxide (MW: approximately 147.25 4908.5 4,000,000; Polyox ™ WSR- 301) Magnesium Stearate 0.75 25 Total Core Tablet Weight (mg) 150 Total Batch size 10 kg (2 × 5 kg) The processing steps to manufacture tablets were as follows:

-   1. A PK V-blender (with I-bar)—4 quart was charged in the following     order:     -   Approximately 600 g of the Polyethylene Oxide 301     -   Hydromorphone HCl     -   Approximately 600 g of the Polyethylene Oxide 301 -   2. Step 1 materials were blended for 2 minutes with the I-bar ON and     then discharged. -   3. A PK V-blender (with I-bar)—16 quart was charged in the following     order:     -   Approximately half of the remaining Polyethylene Oxide 301     -   Pre-blend material (from step 2)     -   Remaining Polyethylene Oxide 301 -   4. Step 3 materials were blended for 5 minutes with the intensifier     bar ON. -   5. Magnesium stearate was charged in the PK V-blender. -   6. Step 5 materials were blended for 1 minute with the intensifier     bar OFF. -   7. Step 6 blend was charged into a plastic bag (Note: two 5 kg     blends were produced to provide 10 kgs available for compression). -   8. Step 7 blend was compressed to target weight on an 8 station     rotary tablet press using 9/32 inch standard round, concave     (embossed) tooling at 40,800 tph speed using 2 kN compression force. -   9. Step 8 tablets were loaded into a 24 inch Compu-Lab coating pan     at a pan load of 9.146 kg. -   10. The pan speed was set to 10 rpm and the tablet bed was heated by     setting the inlet air temperature to achieve an exhaust temperature     of approximately 72° C. The curing starting point (as described by     method 2) was initiated once the exhaust temperature achieved 72° C.     The tablets were cured at the target exhaust temperature for 1 hour.     Tablet samples were taken after 30 minutes of curing. -   11. The pan speed was increased to 15 rpm once the exhaust     temperature reached 72° C. -   12. After 1 hour of curing at the target exhaust temperature, the     inlet temperature was set to 22° C. to initiate cooling. After 3     minutes of cooling the tablet bed massed forming large agglomerates     of tablets. Coating was not feasible. -   13. The tablets were discharged.

It is assumed that the agglomeration of tablets can be avoided, for example by increasing the pan speed, by the use of Magnesium Stearate as anti-tacking agent, or by applying a sub-coating prior to curing.

In vitro testing including dissolution, assay and content uniformity test was performed as follows:

Tablets cured for 30 minutes (uncoated) were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37.0° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×250 mm, 5 μm column, using a mobile phase consisting of a mixture of acetonitrile and potassium phosphate monobasic buffer (pH 3.0) at 220 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 8.0 and 12.0 hours.

Tablets cured for 30 minutes (uncoated) were subjected to the assay test. Oxycodone hydrochloride was extracted from two sets of ten tablets each with 900 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 1000-mL volumetric flask until all tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC_(is) 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

Tablets cured for 30 minutes (uncoated) were subjected to the content uniformity test. Oxycodone hydrochloride was extracted from ten separate tablets each with 90 mL of a 1:2 mixture of acetonitrile and simulated gastric fluid without enzyme (SGF) under constant magnetic stirring in a 100-mL volumetric flask until the tablets were completely dispersed or for overnight. The sample solutions were diluted and analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC₁₈ 3.0×250 mm, 5 μm column maintained at 60° C. using a mobile phase consisting of acetonitrile and potassium phosphate monobasic buffer at pH 3.0 with UV detection at 280 nm.

The results are presented in Table 24.

TABLE 24 Example 24 30 min cure Assay 95.7 (% oxycodone HCl)¹ Content uniformity (% 94.9 oxycodone HCl)¹ Dissolution 1 hr 26 (% Released) 2 hr 39 (n = 6) 4 hr 62 8 hr 89 12 hr  98 ¹relative to the label claim of Oxycodone HCl

Example 25

In Example 25, two different 400 mg tablets including 60 mg (Example 25.1 and 25.2) and 80 mg (Example 25.3 and 25.4) of oxycodone HCl were prepared using high molecular weight polyethylene oxide and low molecular weight polyethylene oxide. Two 100 kg batches were prepared for each formulation.

Example 25 mg/unit mg/unit Ingredient Oxycodone HCl 60 80 Polyethylene oxide (MW: 229.7 216 approximately 4,000,000; Polyox ™ WSR- 301) Polyethylene oxide (MW: 106.3 100 approximately 100,000; Polyox ™ WSR- N10) Magnesium Stearate 4 4 Total Core Tablet Weight (mg) 400 400 Example 25.1 25.2 25.3 25.4 Total Batch size 100 kg 100 kg 100 kg 100 kg Coating Opadry film coating 16 16 Total Tablet Weight (mg) 416 416 Example 25.1 25.2 25.3 25.4 Coating Batch Size (kg) 91.440 96.307 95.568 98.924 The processing steps to manufacture tablets were as follows:

-   1. The magnesium stearate was passed through a Sweco Sifter equipped     with a 20 mesh screen, into a separate suitable container. -   2. A Gemco “V” blender (with I bar)—10 cu. ft. was charged in the     following order:     -   Approximately ½ of the polyethylene oxide WSR 301     -   Oxycodone hydrochloride     -   Polyethylene oxide WSR N10     -   Remaining polyethylene oxide WSR 301 -   3. Step 2 materials were blended for 10 minutes with the I bar on. -   4. Magnesium stearate was charged into the Gemco “V” blender. -   5. Step 4 materials were blended for 2 minutes with the I bar off. -   6. Step 5 blend was charged into a clean, tared, stainless steel     container. -   7. Step 6 blend was compressed to target weight on a 40 station     tablet press at 124,000 tph using 13/32 inch standard round, concave     (embossed) tooling. -   8. Step 7 tablets were loaded into a 48 inch Accela-Coat coating pan     at a load of 91.440 kg (Example 25.1), 96.307 kg (Example 25.2),     95.568 kg (Example 25.3) and 98.924 kg (Example 25.4). -   9. The pan speed was set at 6 to 10 rpm and the tablet bed was     warmed using an exhaust air temperature to target a 55° C. inlet     temperature. Film coating was started once the exhaust temperature     approached 40° C. and continued for 10, 15 or 16 minutes. This     initial film coat was performed to provide an “overcoat” for the     tablets to function as an anti-tacking agent during the curing     process. -   10. After completion of the “overcoat”, the tablet bed was heated by     setting the exhaust air temperature to achieve a target inlet air     temperature of 75° C. (Example 25.1 and 25.3) or to achieve a target     exhaust temperature of 78° C. (Example 25.2 and 25.4). The tablets     were cured at the target temperature for 65 minutes (Example 25.1),     52 minutes (Example 25.2), 80 minutes (Example 25.3) and 55 minutes     (Example 25.4). For Example 25.1 and 25.3, the curing starting point     (as described by method 1) was initiated once the inlet temperature     reached the target inlet temperature. For Example 25.2 and 25.4, the     curing starting point (as described by method 2) was initiated once     the exhaust temperature reached the target exhaust temperature. The     temperature profile of the curing processes of Examples 25.1 to 25.4     is presented in Tables 25.1.1 to 25.4.1. -   11. During the curing process, the pan speed was increased from 7 to     9 rpm (Example 25.1 and 25.3) and from 10 to 12 rpm (Example 25.2     and 25.4). For examples 25.1 to 25.4, 20 g of magnesium stearate was     added as an anti-tacking agent. The tablet bed was cooled by setting     the exhaust temperature setting to 30° C. -   12. After cooling, the tablet bed was warmed using an inlet setting     of 53° C. The film coating was started once the exhaust temperature     achieved approximately 39° C. and continued until the target weight     gain of 4% was achieved. -   13. After film coating was completed, the tablet bed was cooled by     setting the exhaust temperature to 27° C. The tablet bed was cooled     to an exhaust temperature of 30° C. or less was achieved. -   14. The tablets were discharged.

In vitro testing including breaking strength tests was performed as follows.

Cured and coated tablets were tested in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) at 37° C. Samples were analyzed by reversed-phase high performance liquid chromatography (HPLC) on Waters Atlantis dC18 3.0×150 mm, 3 μm column, using a mobile phase consisting of a mixture of acetonitrile and non basic potassium phosphate buffer (pH 3.0) at 230 nm UV detection. Sample time points include 1.0, 2.0, 4.0, 6.0, 8.0 and 12.0 hours.

Uncured tablets were subjected to a breaking strength test by applying a force of a maximum of 196 Newton using a Schleuniger 2E/106 apparatus to evaluate tablet resistance to breaking.

The results are presented in Tables 25.1.2 to 25.4.2

TABLE 25.1.1 Temperature profile of the curing process for Ex. 25.1 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.) ¹ (° C.) ² (° C.) (° C.) ³ (rpm) Comments  0 — 52 60 41 7 Start curing  5  0 75 60 59 7 15 10 81 65 66 7 25 20 85 68 70 7 35 30 73 71 70 9 45 40 75 72 72 9 55 50 75 72 72 9 65 60 74 72 72 9 70 65 75 72 72 9 End curing, add 20 g Mg St 71 — 74 30 72 9 Start cooling 81 — 32 30 52 9 91 — 24 30 36 9 94 — 23 30 30 9 End cooling ¹determined according to method 1, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 25.1.2 Example 25.1 Uncured cured, coated Tablet Weight (mg) 401 — Dimensions (n = 120) Breaking 112 — strength (N) (n = 50)

TABLE 25.2.1 Temperature profile of the curing process for Ex. 25.2 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments   0 — 69 65 46 10   3 — 75 65 53 10  13 — 85 70 65 10  23 — 90 75 69 10  33  0 90 77 77 10 Start curing  43 10 78 77 75 10  53 20 79 77 77 10  63 30 81 77 77 10  73 40 80 77 77 12  83 50 79 77 77 12  85 52 80 77 77 12 End curing, add 20 g Mg St  86 — 80 30 77 12 Start cooling  96 — 37 30 54 12 106 — 29 25 47 12 116 — 24 25 30 12 End cooling ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 25.2.2 Example 25.2 cured, coated cured, coated Uncured Initial data 2^(nd) test data Tablet Weight (mg) 400 — — Dimensions (n = 120) Breaking 103 — — strength (N) (n = 40) n = 6 n = 6 Dissolution 1 hr — 23 24 (% Released) 2 hr — 39 43 SGF 4 hr — 62 70 6 hr — 79 88 8 hr — 90 99 12 hr  — 97 103

TABLE 25.3.1 Temperature profile of the curing process for Ex. 25.3 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments   0 — 55 65 39 7   5  0 75 65 58 7 Start curing  15 10 82 66 66 7  25 20 86 68 70 7  35 30 76 72 72 7  45 40 75 72 72 7  55 50 75 72 72 7  65 60 75 72 72 9  75 70 74 72 72 9  85 80 74 72 72 9 End curing, add 20 g Mg St  86 — 75 30 72 9 Start cooling  96 — 33 30 53 9 106 — 26 30 39 9 112 — 23 30 30 9 End cooling ¹determined according to method 1, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 25.3.2 Example 25.3 cured, coated cured, coated Uncured Initial data 2^(nd) test data Tablet Weight (mg) 400 — — Dimensions (n = 120) Thickness (mm) — — — Diameter (mm) — — — Breaking 111 — — strength (N) (n = 40)

TABLE 25.4.1 Temperature profile of the curing process for Ex. 25.4 Set Actual Total Curing Inlet exhaust exhaust Pan time time temp. temp. temp. speed (min.) (min.)¹ (° C.)² (° C.) (° C.)³ (rpm) Comments   0 — 60 70 43 10  10 — 80 75 64 10  20 — 85 75 69 10  30 — 88 76 74 10  33  0 88 78 78 10 Start curing  43 10 75 78 76 12  53 20 84 78 79 12  63 30 82 78 78 12  73 40 79 78 78 12  83 50 82 78 78 12  88 55 80 78 78 12 End curing, add 20 g Mg St  89 — 79 30 78 12 Start cooling  99 — 38 25 54 12 109 — 26 25 45 12 113 — 23 25 34 12 End cooling ¹determined according to method 2, ²temperature measured at the inlet, ³temperature measured at the exhaust.

TABLE 25.4.2 Example 25.4 cured, coated cured, coated Uncured Initial data 2^(nd) test data Tablet Weight (mg) 400 — — Dimensions (n = 120) Thickness (mm) — — — Diameter (mm) — — — Breaking 101 — — strength (N) (n = 40) n = 6 n = 6 Dissolution 1 hr — 25 29 (% Released) 2 hr — 42 47 SGF 4 hr — 66 73 6 hr — 84 91 8 hr — 96 99 12 hr  — 100 101

TABLE 25.5 Density (g/cm³)¹ 30 min 60 min Density change Uncured cure cure after curing (%)² Example 25.1 1.205 1.153 1.138 −5.560 Example 25.3 1.207 1.158 1.156 −4.225 ¹The density was measured as described for Example 13. The density value is a mean value of 3 tablets measured; ²The density change after curing corresponds to the observed density change in % of the tablets cured for 60 min in comparison to the uncured tablets.

Example 26

In Example 26, a randomized, open-label, single-dose, four-treatment, four-period, four-way crossover study in healthy human subjects was conducted to assess the pharmacokinetic characteristics and relative bioavailability of three oxycodone tamper resistant formulations (10 mg oxycodone HCl tablets of Examples 7.1 to 7.3 relative to the commercial OxyContin® formulation (10 mg), in the fasted and fed state.

The study treatments were as follows:

Test Treatments:

-   -   Treatment 1A: 1× Oxycodone HCl 10 mg Tablet of Example 7.3         (Formulation 1A) administered in the fasted or fed state.     -   Treatment 1B: 1× Oxycodone HCl 10 mg Tablet of Example 7.2         (Formulation 1B) administered in the fasted or fed state.     -   Treatment 1C: 1× Oxycodone HCl 10 mg Tablet of Example 7.1         (Formulation 1C) administered in the fasted or fed state.

Reference Treatment:

-   -   Treatment OC: 1× OxyContin® 10 mg tablet administered in the         fasted or fed state.

The treatments were each administered orally with 8 oz. (240 mL) water as a single dose in the fasted or fed state.

As this study was conducted in healthy human subjects, the opioid antagonist naltrexone hydrochloride was administered to minimize opioid-related adverse events.

Subject Selection Screening Procedures

The following screening procedures were performed for all potential subjects at a screening visit conducted within 28 days prior to first dose administration:

-   -   Informed consent.     -   Weight, height, body mass index (BMI), and demographic data.     -   Evaluation of inclusion/exclusion criteria.     -   Medical and medication history, including concomitant         medication.     -   Vital signs—blood pressure, respiratory rate, oral temperature,         and pulse rate (after being seated for approximately 5 minutes)         and blood pressure and pulse rate after standing for         approximately 2 minutes—and pulse oximetry (SPO₂), including         “How do you feel?” Inquiry.     -   Routine physical examination (may alternately be performed at         Check-in of Period 1).     -   Clinical laboratory evaluations (including biochemistry,         hematology, and urinalysis [UA]).     -   12-lead electrocardiogram (ECG).     -   Screens for hepatitis (including hepatitis B surface antigen         [HBsAg], hepatitis B surface antibody [HBsAb], hepatitis C         antibody [anti-HCV]), and selected drugs of abuse.     -   Serum pregnancy test (female subjects only).     -   Serum follicle stimulating hormone (FSH) test (postmenopausal         females only)

Inclusion Criteria

Subjects who met the following criteria were included in the study.

-   -   Males and females aged 18 to 50, inclusive.     -   Body weight ranging from 50 to 100 kg (110 to 220 lbs) and a BMI         ≧18 and ≦34 (kg/m²).     -   Healthy and free of significant abnormal findings as determined         by medical history, physical examination, vital signs, and ECG.     -   Females of child-bearing potential must be using an adequate and         reliable method of contraception (e.g., barrier with additional         spermicide foam or jelly, intra-uterine device, hormonal         contraception (hormonal contraceptives alone are not         acceptable). Females who are postmenopausal must have been         postmenopausal ≧1 year and have elevated serum FSH.     -   Willing to eat all the food supplied during the study.

Exclusion Criteria

The following criteria excluded potential subjects from the study.

-   -   Females who are pregnant (positive beta human chorionic         gonadotropin test) or lactating.     -   Any history of or current drug or alcohol abuse for 5 years.     -   History of or any current conditions that might interfere with         drug absorption, distribution, metabolism or excretion.     -   Use of an opioid-containing medication in the past 30 days.     -   History of known sensitivity to oxycodone, naltrexone, or         related compounds.     -   Any history of frequent nausea or emesis regardless of etiology.     -   Any history of seizures or head trauma with current sequelae.     -   Participation in a clinical drug study during the 30 days         preceding the initial dose in this study.     -   Any significant illness during the 30 days preceding the initial         dose in this study.     -   Use of any medication including thyroid hormone replacement         therapy (hormonal contraception is allowed), vitamins, herbal,         and/or mineral supplements, during the 7 days preceding the         initial dose.     -   Refusal to abstain from food for 10 hours preceding and 4 hours         following administration of the study drugs and to abstain from         caffeine or xanthine entirely during each confinement.     -   Consumption of alcoholic beverages within forty-eight (48) hours         of initial study drug administration (Day 1) or anytime         following initial study drug administration.     -   History of smoking or use of nicotine products within 45 days of         study drug administration or a positive urine cotinine test.     -   Blood or blood products donated within 30 days prior to         administration of the study drugs or anytime during the study,         except as required by this protocol.     -   Positive results for urine drug screen, alcohol screen at         Check-in of each period, and HBsAg, HBsAb (unless immunized),         anti-HCV.     -   Positive Naloxone HCl challenge test.     -   Presence of Gilbert's Syndrome or any known hepatobiliary         abnormalities.     -   The Investigator believes the subject to be unsuitable for         reason(s) not specifically stated in the exclusion criteria.

Subjects meeting all the inclusion criteria and none of the exclusion criteria were randomized into the study. It was anticipated that approximately 34 subjects would be randomized, with 30 subjects targeted to complete the study. Any subject who discontinued could be replaced.

Subjects were assigned by the random allocation schedule (RAS) in a 2:1 ratio to fasted or fed state, with twenty subjects to be randomized to a fasted state and 10 subjects to be randomized to a fed state.

Check-in Procedures

On Day −1 of Period 1, subjects were admitted to the study unit and received a Naloxone HCl challenge test. The results of the test had to be negative for subjects to continue in the study. Vital signs and SPO₂ were measured prior to and following the Naloxone HCl.

The following procedures were also performed for all subjects at Check-in for each period:

-   -   Verification of inclusion/exclusion criteria, including         verification of willingness to comply with caffeine or xanthine         restriction criteria.     -   Routine physical examination at Check-in of Period 1 only (if         not performed at Screening).     -   Vital signs-blood pressure, respiratory rate, and pulse rate         (after being seated for approximately 5 minutes) and SPO₂,         including How Do You Feel? Inquiry.     -   Screen for alcohol (via breathalyzer test), cotinine, and         selected drugs of abuse.     -   Urine pregnancy test (for all female subjects).     -   Verification of medication and medical history.     -   Concomitant medication monitoring and recording.     -   Adverse Event monitoring and recording.

For subjects to continue their participation in the study, the results of the drug screen (including alcohol and cotinine) had to be available and negative prior to dosing. In addition, continued compliance with concomitant medication and other restrictions were verified at Check-in and throughout the study in the appropriate source documentation.

Prior to the first dose in Period 1, subjects were randomized to a treatment sequence in which test and reference treatments are received in a specified order. The treatment sequence according to the random allocation schedule (RAS) was prepared by a biostatistician who was not involved in the evaluation of the results of the study. Randomization was used in this study to enhance the validity of statistical comparisons across treatments.

The treatment sequences for this study are presented in Table 26.1:

TABLE 26.1 Period 1 Period 2 Period 3 Period 4 Sequence Treatment 1 OC 1C 1A 1B 2 1A OC 1B 1C 3 1B 1A 1C OC 4 1C 1B OC 1A

Study Procedures

The study included four study periods, each with a single dose administration. There was a washout period of seven days between dose administrations in each study period. During each period, subjects were confined to the study site from the day prior to administration of the study drugs through 48 hours following administration of the study drugs, and returned to the study site for 72-hour procedures.

At each study period, the subjects were administered one of the test oxycodone formulations (10 mg) or OxyContin® 10 mg tablets (OC) with 240 mL of water, following a 10 hour overnight fast (for fasted treatments). Subjects receiving fasted treatments continued fasting from food for 4 hours following dosing. Subjects receiving fed treatments started the standard meal (FDA high-fat breakfast) 30 minutes prior to administration of the drug. Subjects were dosed 30 minutes after start of the meal and no food was allowed for at least 4 hours post-dose.

Subjects received naltrexone HCl 50 mg tablets at −12, 0, 12, 24, and 36 hours relative to each test formulation or OxyContin® dosing.

Subjects were standing or in an upright sitting position while receiving their dose of study medication. Subjects remained in an upright position for a minimum of 4 hours.

Clinical laboratory sampling was preceded by a fast (i.e. at least 10 hours) from food (not including water). Fasting was not required for non-dosing study days.

During the study, adverse events and concomitant medications were recorded, and vital signs (including blood pressure, body temperature, pulse rate, and respiration rate) and SPO₂ were monitored.

Blood samples for determining oxycodone plasma concentrations were obtained for each subject at predose and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 8, 10, 12, 16, 24, 28, 32, 36, 48, and 72 hours postdose for each period.

For each sample, 6 mL of venous blood were drawn via an indwelling catheter and/or direct venipuncture into tubes containing K₂EDTA anticoagulant (6 mL-draw K₂EDTA Vacutainer® evacuated collection tubes). Plasma concentrations of oxycodone were quantified by a validated liquid chromatography tandem mass spectrometric method.

Study Completion Procedures

The following procedures were performed in the clinic for all subjects at End of Study (Study Completion) or upon discontinuation from the study:

-   -   Concomitant medication evaluation.     -   Vital signs and SPO₂, including How Do You Feel? inquiry.     -   Physical examination.     -   12-Lead ECG.     -   Clinical laboratory evaluations (including biochemistry [fasted         at least 10 hours], hematology, and urinalysis).     -   Adverse event evaluations.     -   Serum pregnancy test (for female subjects only).

The results of this study are shown in Tables 26.2 to 26.5.

TABLE 26.2 Mean plasma pharmacokinetic metrics data Treatments 1A, 1B, 1C and OC (fed state) Treatment 1A-fed C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 12 12 12 11 12 12 12 MEAN 11.3 5.08 122 134 4.22 0.170 0.0833 SD 5.54 2.46 55.3 42.5 0.884 0.0292 0.195 MIN 0.372 1.00 1.13 86.2 3.34 0.114 0 MEDIAN 10.7 5.00 120 121 3.94 0.177 0 MAX 20.5 10.0 221 223 6.10 0.207 0.500 GEOMEAN 8.63 NA 85.8 128 NA NA NA Treatment 1B-fed C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 12 12 12 12 12 12 12 MEAN 14.2 5.25 133 134 4.37 0.164 0.0833 SD 3.36 1.48 40.2 40.3 0.947 0.0283 0.195 MIN 8.11 3.00 63.7 64.5 3.28 0.0990 0 MEDIAN 14.2 5.00 126 127 4.22 0.165 0 MAX 18.5 8.00 205 207 7.00 0.211 0.500 GEOMEAN 13.8 NA 127 128 NA NA NA Treatment 1C-fed C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 12 12 12 12 12 12 12 MEAN 17.1 4.21 138 139 4.41 0.162 0.0417 SD 4.66 1.21 42.9 42.9 0.843 0.0263 0.144 MIN 11.6 1.50 91.4 92.5 3.43 0.107 0 MEDIAN 16.5 4.50 122 123 4.03 0.173 0 MAX 27.9 6.00 218 219 6.49 0.202 0.500 GEOMEAN 16.5 NA 133 134 NA NA NA Treatment OC-fed C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 12 12 12 12 12 12 12 MEAN 13.2 3.17 142 143 4.83 0.146 0 SD 3.20 1.85 39.3 39.5 0.702 0.0189 0 MIN 8.85 1.00 95.2 95.9 3.93 0.105 0 MEDIAN 12.3 2.25 124 125 4.76 0.146 0 MAX 18.1 6.00 218 219 6.59 0.176 0 GEOMEAN 12.8 NA 137 138 NA NA NA NA = not applicable.

TABLE 26.3 Mean plasma pharmacokinetic metrics data Treatments 1A, 1B, 1C and OC (fasted state) Treatment 1A-fasted C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 20 20 20 20 20 20 20 MEAN 8.84 4.60 109 111 4.66 0.156 0.0250 SD 2.25 1.90 20.1 20.3 1.26 0.0279 0.112 MIN 4.85 2.00 69.0 69.8 3.56 0.0752 0 MEDIAN 8.53 5.00 114 114 4.29 0.162 0 MAX 13.2 10.0 138 139 9.22 0.195 0.500 GEOMEAN 8.56 NA 108 109 NA NA NA Treatment 1B-fasted C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 19 19 19 19 19 19 19 MEAN 9.97 4.58 115 116 4.67 0.156 0 SD 1.82 1.18 23.8 23.8 1.24 0.0309 0 MIN 6.90 2.00 75.2 76.3 3.53 0.0878 0 MEDIAN 10.0 5.00 121 122 4.35 0.159 0 MAX 14.1 6.00 152 153 7.90 0.197 0 GEOMEAN 9.81 NA 113 114 NA NA NA Treatment 1C-fasted C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 22 22 22 22 22 22 22 MEAN 13.6 3.75 110 111 4.18 0.169 0.0227 SD 3.79 1.38 18.5 18.5 0.594 0.0256 0.107 MIN 8.64 1.00 70.6 71.1 2.92 0.135 0 MEDIAN 12.9 3.75 112 113 4.13 0.169 0 MAX 23.7 6.00 142 143 5.14 0.237 0.500 GEOMEAN 13.2 NA 108 109 NA NA NA Treatment OC-fasted C_(max) t_(max) AUC_(t) AUC_(inf) t_(1/2z) λ_(z) t_(lag) (ng/mL) (hr) (ng · hr/mL) (ng · hr/mL) (hr) (1/hr) (hr) N 19 19 19 19 19 19 19 MEAN 9.73 2.82 114 115 4.82 0.154 0 SD 1.67 0.960 26.0 26.2 1.41 0.0379 0 MIN 7.38 1.00 76.3 77.8 3.11 0.0839 0 MEDIAN 9.57 3.00 112 112 4.37 0.159 0 MAX 13.2 5.00 181 183 8.27 0.223 0 GEOMEAN 9.60 NA 112 113 NA NA NA NA = not applicable.

TABLE 26.4 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 7.1 to 7.3 Tablets Relative to OxyContin ® 10 mg in the Fed State (Population: Full Analysis) Cmax AUCt LS Mean LS Mean Ratio 90% Ratio 90% Comparison (test/ Confidence (test/ Confidence (Test vs. Ref) reference)^(a) Interval^(b) reference)^(a) Interval^(b) 1A vs. OC 67.5 [47.84, 95.16]  62.6 [39.30, 99.83]  1B vs. OC 108.0 [76.59, 152.33] 92.9 [58.31, 148.14] 1C vs. OC 129.0 [91.54, 182.07] 97.0 [60.83, 154.52] ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means; Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale (test = Treatment 1A, 1B, 1C; reference = Treatment OC); ^(b)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

TABLE 26.5 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 7.1 to 7.3 Tablets Relative to OxyContin ® 10 mg in the Fasted State (Population: Full Analysis) Cmax AUCt LS Mean LS Mean Comparison Ratio 90% Ratio 90% (Test vs. (test/ Confidence (test/ Confidence Ref) reference)^(a) Interval^(b) reference)^(a) Interval^(b) 1A vs. OC 89.5 [82.76, 96.89] 97.0 [92.26, 102.79] 1B vs. OC 99.0  [91.33, 107.30] 101.0 [95.42, 106.57] 1C vs. OC 133.0 [123.23, 143.86] 96.4 [91.43, 101.68] ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means; Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale (test = Treatment 1A, 1B, 1C; reference = Treatment OC); ^(b)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

Example 27

In Example 27, oxycodone HCl tablets of Example 7.2, and Example 14.2 to 14.5 containing 10, 15, 20, 30, and 40 mg oxycodone HCl respectively were subjected to a variety of tamper resistance testing, using mechanical force and chemical extraction to evaluate their resistance to physical and chemical manipulation.

Test results are compared to control data, defined as percent Active Pharmaceutical Ingredient (API) released for intact tablets after in vitro dissolution in Simulated Gastric Fluid without enzyme (SGF) for 45 minutes. This comparator was chosen as a reference point to approximate the amount of API present in the body (after 45 min) when the product is taken as directed. Available results for the current marketed formulation, OxyContin™, are presented for comparison as well.

Five different strength tablets (10, 15, 20, 30 and 40 mg oxycodone HCl, corresponding to Example 7.2, and Examples 14.2 to 14.5) were manufactured. All tablet strengths are about the same size and weight, therefore all testing was performed on the bracketing tablet strengths with the lowest API to excipient ratio (10 mg, Example 7.2) and the highest API to excipient ratio (40 mg, Example 14.5). In addition, level 1 testing was performed on the intermediate tablet strengths (15, 20 and 30 mg, Examples 14.2, 14.3 and 14.4) to assess the resistance to physical manipulation, and subsequent chemical extraction, when using a mortar and pestle. Further testing was not performed on these tablets as higher levels of testing employ a coffee mill which resulted in similar particle size distributions and similar amount of extracted API for the milled bracketing tablets (Example 7.2 and 14.5).

The experimental techniques used for this testing were designed to provide procedures for simulating and evaluating common methods of abuse. Four levels of tamper resistance were broadly defined to provide an approximation of the relative level of tamper resistance. Several approaches to tampering were considered; these include mechanical force (applied to damage the drug product), availability and toxicity of extraction solvents, length of extraction, and thermal treatment. Each higher level of tamper resistance represents an increase in the degree of difficulty necessary to successfully tamper with a drug product. The definitions of levels of tamper resistance, including examples of equipment and reagents, are presented in Table 27.1.

TABLE 27.1 Definitions and Examples of Testing Degree Of Equipment Level Definition Difficulty Examples Reagent Examples 0 Able to be directly abused Negligible N/A None without preparation 1 Readily abused through a Minimal Crushing tool water, variety of means without reagent (hammer, shoe, distilled spirits or with an easily obtainable pill crusher, etc) (vodka, gin, etc), reagent vinegar, Reagents are directly ingestible baking soda, and extraction time is shorter cooking oil 2 Readily abused with additional Moderate Tools for IV 100% ethanol (grain preparation requiring some preparation, alcohol, Everclear) planning milling tool strong acidic and Reagents are directly ingestible, (coffee mill, basic solutions although more harmful, blender), extraction time is shorter, and microwave oven thermal treatment is applied 3 Preparation for abuse requires Substantial Impact mill In addition to knowledge of drug chemistry, (e.g., Fitzmill) previously listed includes less readily available solvents: reagents, may require industrial methanol, tools, involves complex ether, processes (e.g., two-phase isopropanol, extraction) acetone, Some reagents are harmful and ethyl acetate not directly ingestible, extraction time and temperature are increased

Testing Results Control Data (“Taken as Directed”) and Specification Limits

Dissolution testing on intact Example 7.2, and Example 14.2 to 14.5 tablets was performed in vitro using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C. Samples were taken at 45 minutes of dissolution and analyzed by reversed-phase high performance liquid chromatography (HPLC). The average results of a triplicate analysis are reported in Table 27.2 and compared to equivalent data for OxyContin™ 10 mg tablets.

TABLE 27.2 Control Results-% API Released at 45 minutes % oxycodone HCl¹ released at 45 minutes Ex. Ex. Ex. Ex. Ex. 7.2 14.2 14.3 14.4 14.5 Sample OxyContin ™ (10 (15 (20 (30 (40 Preparation 10 mg mg) mg) mg) mg) mg) None 34 19 20 20 18 19 (intact tablets) ¹relative to label claim

In addition, Table 27.3 contains the one hour dissolution specification limits for each of the tablets studied. This illustrates the range of acceptable drug release at one hour for all formulations tested in this study. It should be noted that the upper acceptable limit for one hour in vitro release of oxycodone HCl from OxyContin 10 mg tablets is 49%.

TABLE 27.3 Dissolution (% Released) Specification Limits Product 1 Hr Specification Limit Example 7.2 15-35 Example 14.2 15-35 Example 14.3 15-35 Example 14.4 15-35 Example 14.5 15-35 OxyContin ™ 10 mg 29-49

Level 1 Testing

Level one testing included crushing with a mortar and pestle and simple extraction.

Level 1 Results—Crushing

After crushing in a mortar and pestle, in vitro dissolution testing was performed in triplicate for each product using USP Apparatus 1 (basket) at 100 rpm in 900 ml simulated gastric fluid without enzymes (SGF) at 37° C., as described above for control data. Example 7.2 tablets were not able to be crushed using a mortar and pestle and therefore release of the API was not significantly increased as compared to the control results. Although difficult, tablets of Examples 14.2 to 14.5 (15, 20, 30 and 40 mg tablets) could be broken into large pieces using a mortar and pestle producing little to no powder. This reduction in particle size resulted in higher release of the API; however, the swelling of the tablet matrix, when dissolved in SGF, provides protection against dose dumping as less than half of the API was released after 45 minutes. The OxyContin™ tablets were easily reduced to a powder using a mortar and pestle resulting in release of most of the API. FIG. 40 contains representative images of crushed tablets. Table 27.4 contains the average results for percent API released after crushing.

TABLE 27.4 Crushing Results-% API Released at 45 Minutes % oxycodone HCl¹ released at 45 min. Ex. Ex. Ex. Ex. Ex. 7.2 14.2 14.3 14.4 14.5 Sample OxyContin ™ (10 (15 (20 (30 (40 Preparation 10 mg mg) mg) mg) mg) mg) Crushed tablets 92 20 41 44 42 43 Control-intact 34 19 20 20 18 19 tablets (45 min release) ¹relative to label claim

Additionally, Example 14.5 tablets could not be crushed between two spoons demonstrating that additional tools would need to be employed to crush the tablets. Conversely, the OxyContin™ tablets were easily crushed between two spoons.

Level 1 Results—Simple Extraction

Example 7.2, and Example 14.2 to 14.5 tablets were crushed in a mortar and pestle and vigorously shaken on a wrist-action shaker, over a 10° angle, for 15 minutes in various solvents at room temperature. As previously stated, Example 7.2 tablets were unaffected by crushing in a mortar and pestle and therefore extraction amounts were not increased. Example 14.2 to 14.5 tablets were crushed using a mortar and pestle before extraction. Due to the swelling of the tablet matrix in the solvents tested, the crushed tablets remained resistant to comprehensive dose dumping, whereas the OxyContin™ tablets released nearly all of the API. Table 27.5 contains the average amount of API released in each solvent.

TABLE 27.5 Simple Extraction Results-% API Released at 15 Minutes % oxycodone HCl¹ released Crushed Ex. Ex. Ex. Ex. Ex. Tablets in 7.2 14.2 14.3 14.4 14.5 Extraction OxyContin ™ (10 (15 (20 (30 (40 Solvent (10 mg) mg) mg) mg) mg) mg) Water 92 8 32 30 28 51 40% EtOH (v/v) 101 5 24 18 22 40 Vinegar 102 11 28 35 41 54 Cooking Oil 79 0 2 1 2 6 0.026M Baking 95 6 26 25 29 50 Soda Solution Control- 34 19 20 20 18 19 intact tablets (45 min release) ¹relative to label claim

Level 2 Testing

Level two testing included milling, simulated intravenous (IV) preparation, thermal treatment and extraction.

Level 2 Results—Milling

Example 7.2 and Example 14.5 tablets were ground in a Cuisanart® coffee mill with stainless steel blades (model DCG-12BC) for 1 minute. The energy output of the coffee mill (1 minute) was determined to be 10.5 kJ. In triplicate, material equivalent to one dosage unit was removed and analyzed by dissolution testing using USP Apparatus 1 (basket) at 100 rpm in 900 nil simulated gastric fluid without enzymes (SGF) at 37° C., as described above for the control data. After one minute, Example 7.2 and Example 14.5 tablets were milled to similar particle size distributions resulting in both tablet strengths releasing approximately half of the API. The OxyContin™ tablets were milled into a mixture of larger pieces and some powder resulting in nearly complete release of the API. Table 27.6 contains the average amount of API released from the milled tablets. As previously mentioned, the ground Example 7.2 and 14.5 tablets swell and become gelatinous. This phenomenon provides protection against dose dumping. FIG. 41 contains representative images of milled tablets before and after dissolution.

TABLE 27.6 Milling Results - % API Released at 45 Minutes % oxycodone HCl¹ released OxyContin Ex. 7.2 Ex. 14.5 Sample Preparation (10 mg) (10 mg) (40 mg) Milled tablets 93 47 52 Control - intact tablets 34 19 19 (45 min release) ¹relative to label claim

Relative In Vitro Dissolution Rate

To assess the relative rate of release of the API, dissolution samples were collected every five minutes from t=0 to t=40 minutes for milled Ex 7.2 tablets (coffee mill) and crushed OxyContin™ 10 mg tablets (mortar and pestle). The OxyContin™ tablet is more easily and effectively crushed using a mortar and pestle. Although approximately half of the API is released from milled Example 7.2 tablets over 45 minutes, it is released at a gradual rate that is characteristic of a controlled released product. Dose dumping is not observed. Conversely, dissolution of milled OxyContin™ tablets results in complete dose dumping within 10 minutes. This is illustrated in FIG. 42.

Particle Size Distribution of Milled Tablets

Milled Example 7.2 and 14.5 tablets (coffee mill) and crushed OxyContin™ 10 mg tablets (mortar and pestle) were analyzed by sieving to evaluate the particle size distribution of the milled material. The tablets were sieved for 12 minutes using vibration. The sieves used and the corresponding mesh sizes are presented in Table 27.7. As shown in the particle size distribution graphs in FIG. 43, 70-80% of the milled Example 7.2 and 14.5 tablets are larger than 600 μm. The large particle size of the milled material is likely disagreeable to snorting. OxyContin™ 10 mg resulted in a much smaller particle size distribution.

TABLE 27.7 Sieve Sizes and Corresponding Mesh Size Sieve Number Mesh Size (μm) 30 600 40 425 60 250 80 180 120 125 200 75 325 45

Level 2 Results—Simulated Intravenous Preparation

Example 7.2 and 14.5 tablets were milled in the coffee mill (as described above) and placed onto a spoon. The OxyContin™ 10 mg tablets were crushed between two spoons. Two milliliters of water were added to each spoon to extract or dissolve the drug product. The milled Example 7.2 and 14.5 tablets became viscous after the water was added which resulted in a small amount (<0.3 nil) of the liquid being able to be drawn into an insulin syringe and analyzed for API content. Very little API was recovered. Approximately one milliliter containing half of the API was recovered for the crushed OxyContin 10 mg tablets. Table 27.8 contains the simulated intravenous preparation results.

TABLE 27.8 Simulated IV Results - % API Released % oxycodone HCl¹ released OxyContin ™ Ex. 7.2 Ex. 14.5 Sample Preparation (10 mg) (10 mg) (40 mg) Simulated IV prep 49 1 4 Control - intact 34 19 19 tablets (45 min release) ¹relative to label claim

Level 2 Results—Thermal Treatment

Thermal treatment was attempted in the microwave; however, testing was unsuccessful in small volumes of water. The milled Example 7.2 and 14.5 tablet material could not be contained in 10-20 ml of boiling water therefore the amount of water was increased to 100 ml. After 3 minutes at high power in an 800 Watt microwave oven (GE Model JE835), the remaining liquid was analyzed for API content. Additionally, extraction in a small amount of boiling water was assessed by adding 10 ml of boiling water to a vial containing a milled tablet. The vial was vigorously shaken for 15 minutes. As shown in Table 27.9, after applying thermal treatment the milled tablet retained controlled release properties that prevented complete dose dumping. The microwave experiment was not performed on crushed OxyContin tablets; however, comparison data from the boiling water experiment is presented.

TABLE 27.9 Thermal Treatment Results - % API Released % oxycodone HCl¹ released OxyContin Ex. 7.2 Ex. 14.5 Sample Preparation (10 mg) (10 mg) (40 mg) Milled tablets in 100 ml hot water N/A 44 52 (microwave 3 min) Milled tablets with 10 ml hot water 89 58 61 (15 minutes shaken) Control - intact tablets 34 19 19 (45 min release) ¹relative to label claim

Level 2 Results—Extraction

Example 7.2 and 14.5 tablets were milled in a coffee mill (as per the method described above) and subsequently shaken for 15 minutes in various solvents at room temperature. The OxyContin™ tablets were crushed using a mortar and pestle. Table 27.10 contains the average amount of API released in each solvent. The milled tablets remained resistant to comprehensive dose dumping in a variety of solvents.

TABLE 27.10 Extraction Results - % API Released at 15 Minutes % oxycodone HCl¹ released Milled Tablets with OxyContin Ex. 7.2 Ex. 14.5 Extraction Solvent (10 mg) (10 mg) (40 mg) 100% EtOH 96 53 48 0.1N HCl 97 45 51 0.2N NaOH 16 27 17 Control - intact tablets 34 19 19 (45 min release) ¹relative to label claim

Level 3 Testing

Level 3 testing included extraction for 60 minutes at Room Temperature (RT) and 50° C.

Level 3 Results—Advanced Extraction (RT, 50° C.)

Example 7.2 and 14.5 tablets were milled in a coffee mill (as per the method described above) and subsequently vigorously shaken for 60 minutes in various solvents at room temperature. Additionally, the milled tablets were extracted in various solvents held at 50° C. for 60 minutes using a heated water bath. Stir bars were placed in each vial to agitate the liquid. After one hour of extraction the ground tablets retained some controlled release properties that provided protection against complete dose dumping. Extraction at elevated temperatures is not significantly more effective due to the increased solubility of the tablet matrix at higher temperatures in most of the solvents tested. In Table 27.11, amounts released for Example 7.2 and 14.5 tablets are compared to 15 minute extraction for crushed OxyContin™ 10 mg tablets.

TABLE 27.11 Advanced Extraction Results-% API Released at 60 Minutes % Oxycodone¹ % Oxycodone¹ Milled Released (RT) Released (50° C.) Tablets Ex. Ex. Ex. Ex. with 7.2 14.5 7.2 14.5 Extraction *OxyContin (10 (40 *OxyContin (10 (40 Solvent (10 mg) mg) mg) 10 mg mg) mg) 40% Ethanol (v/v) 101 55 56 N/A 61 65 100% Ethanol 96 66 61 78 67 Cooking Oil 79 2 4 7 4 0.1N HCl 97 58 62 62 69 0.2N NaOH 16 38 35 41 17 70% isopropanol 97 48 35 49 69 (v/v) Acetone 60 37 38 N/A N/A Methanol 92 71 82 72 61 Ethyl Acetate 83 25 5 39 30 Ether 78 10 2 N/A N/A Control-intact 34 19 19 34 19 19 tablets (45 min release) ¹relative to label claim; *Crushed OxyContin data at 15 min for comparison.

Example 28

In Example 28, a randomized, open-label, single-center, single-dose, two-treatment, two-period, two-way crossover study in healthy human subjects was conducted to assess the bioequivalence of Example 14.1 oxycodone HCl (10 mg) formulation relative to the commercial OxyContin® formulation (10 mg) in the fed state.

The study treatments were as follows:

Test treatment: 1× Example 14.1 tablet (10 mg oxycodone HCl) Reference treatment: 1× OxyContin® 10 mg tablet

The treatments were each administered orally with 8 oz. (240 mL) water as a single dose in the fed state.

As this study was conducted in healthy human subjects, the opioid antagonist naltrexone hydrochloride was administered to minimize opioid-related adverse events.

Subject Selection

Screening procedures were performed as described for Example 26.

Subjects who met the inclusion criteria as described for Example 26 were included in the study. Potential subjects were excluded from the study according to the exclusion criteria as described for Example 26, except that item 11 of the exclusion criteria for this study refers to “refusal to abstain from food for 4 hours following administration of the study drugs and to abstain from caffeine or xanthine entirely during each confinement.”

Subjects meeting all the inclusion criteria and none of the exclusion criteria were randomized into the study. It was anticipated that approximately 84 subjects would be randomized, with approximately 76 subjects targeted to complete the study.

Check-in Procedures

The check-in procedures performed on day −1 of period 1 and at check-in for each period were performed as described in Example 26. Pre-dose (Day −1, Period 1 only) laboratory samples (hematology, biochemistry, and urinalysis) were collected after vital signs and SPO₂ had been measured following overnight fasting (10 hours).

Prior to the first dose in Period 1, subjects were randomized to a treatment sequence according to the random allocation schedule (RAS) as described for Example 26. The treatment sequences for this study are presented in Table 28.1.

TABLE 28.1 Period 1 Period 2 Sequence Treatment 1 1x OxyContin ® 10 mg 1x Example 14.1 2 1x Example 14.1 1x OxyContin ® 10 mg

Study Procedures

The study included two study periods, each with a single dose administration. There was a washout period of at least six days between dose administrations in each study period. During each period, subjects were confined to the study site from the day prior to administration of the study drugs through 48 hours following administration of the study drugs, and subjects returned to the study site for 72-hour procedures.

At each study period, following a 10 hour overnight fast, the subjects were fed a standard meal (FDA high-fat breakfast) 30 minutes prior to administration of either Example 14.1 formulation or OxyContin® 10 mg tablets with 240 mL of water. No food was allowed for at least 4 hours post-dose.

Subjects received naltrexone HCl 25 mg tablets at −12, 0, and 12 hours relative to Example 14.1 formulation or OxyContin® dosing.

Subjects were standing or in an upright sitting position while receiving their dose of Example 14.1 formulation or OxyContin®. Subjects remained in an upright position for a minimum of 4 hours.

Fasting was not required for non-dosing study days.

During the study, adverse events and concomitant medications were recorded, and vital signs (including blood pressure, body temperature, pulse rate, and respiration rate) and SPO₂ were monitored.

Blood samples for determining oxycodone plasma concentrations were obtained for each subject at predose and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 8, 10, 12, 16, 24, 28, 32, 36, 48, and 72 hours postdose for each period.

For each sample, 6 mL of venous blood were drawn via an indwelling catheter and/or direct venipuncture into tubes containing K₂EDTA anticoagulant. Plasma concentrations of oxycodone were quantified by a validated liquid chromatography tandem mass spectrometric method.

The study completion procedures were performed as described for Example 26.

The results of this study are shown in Table 28.2.

TABLE 28.2 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 14.1 Formulation Relative to OxyContin ® 10 mg in the Fed State (Population: Full Analysis) Test/ 90% LS Mean^(a) Refer- Confidence Metric N (Test)^(b) N (Reference)^(b) ence^(c) Interval^(d) C_(max) (ng/mL) 79 13.9 81 13.3 105 (101.06; 108.51) AUC_(t) (ng*hr/ 79 138 81 145 95.7 (93.85; 97.68) mL) AUC_(inf) 79 139 81 146 95.6 (93.73; 97.53) (ng*hr/mL) ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means. ^(b)Test = Example 14.1 tablet; Reference = OxyContin ® 10 mg tablet. ^(c)Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale. ^(d)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

The results show that Example 14.1 tablets are bioequivalent to OxyContin® 10 mg tablets in the fed state.

Example 29

In Example 29, a randomized, open-label, single-center, single-dose, two-treatment, two-period, two-way crossover study in healthy human subjects was conducted to assess the bioequivalence of Example 14.1 oxycodone HCl (10 mg) formulation relative to the commercial OxyContin® formulation (10 mg) in the fasted state.

The study treatments were as follows:

Test treatment: 1× Example 14.1 tablet (10 mg oxycodone HCl) Reference treatment: 1× OxyContin® 10 mg tablet

The treatments were each administered orally with 8 oz. (240 mL) water as a single dose in the fasted state.

As this study was conducted in healthy human subjects, the opioid antagonist naltrexone hydrochloride was administered to minimize opioid-related adverse events.

Subject Selection

Screening procedures were performed as described for Example 26.

Subjects who met the inclusion criteria as described for Example 26 were included in the study. Potential subjects were excluded from the study according to the exclusion criteria as described for Example 26.

Subjects meeting all the inclusion criteria and none of the exclusion criteria were randomized into the study. It was anticipated that approximately 84 subjects would be randomized, with approximately 76 subjects targeted to complete the study.

Check-in Procedures

The check-in procedures performed on day −1 of period 1 and at check-in for each period were performed as described in Example 26. Pre-dose (Day −1, Period 1 only) laboratory samples (hematology, biochemistry, and urinalysis) were collected after vital signs and SPO₂ had been measured following overnight fasting (10 hours).

Prior to the first dose in Period 1, subjects were randomized to a treatment sequence according to the random allocation schedule (RAS) as described for Example 26. The treatment sequences for this study are presented in Table 29.1.

TABLE 29.1 Period 1 Period 2 Sequence Treatment 1 1x OxyContin ® 10 mg 1x Example 14.1 2 1x Example 14.1 1x OxyContin ® 10 mg

Study Procedures

The study included two study periods, each with a single dose administration. There was a washout period of at least six days between dose administrations in each study period. During each period, subjects were confined to the study site from the day prior to administration of the study drugs through 48 hours following administration of the study drugs, and subjects returned to the study site for 72-hour procedures.

At each study period, the subjects were administered the Example 14.1 formulation or OxyContin® 10 mg tablets with 240 mL of water, following a 10 hour overnight fast. Subjects continued fasting from food for at least 4 hours post-dose.

Subjects received naltrexone HCl 25 mg tablets at −12, 0, and 12 hours relative to Example 14.1 formulation or OxyContin® dosing.

Subjects were standing or in an upright sitting position while receiving their dose of Example 14.1 formulation or OxyContin®. Subjects remained in an upright position for a minimum of 4 hours.

Clinical laboratory sampling (Day −1) was preceded by a fast (i.e. at least 10 hours) from food (not including water). Fasting was not required for non-dosing study days.

During the study, adverse events and concomitant medications were recorded, and vital signs (including blood pressure, body temperature, pulse rate, and respiration rate) and SPO₂ were monitored.

Blood samples for determining oxycodone plasma concentrations were obtained for each subject at predose and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 8, 10, 12, 16, 24, 28, 32, 36, 48, and 72 hours postdose for each period.

For each sample, 6 mL of venous blood were drawn via an indwelling catheter and/or direct venipuncture into tubes containing K₂EDTA anticoagulant. Plasma concentrations of oxycodone were quantified by a validated liquid chromatography tandem mass spectrometric method.

The study completion procedures were performed as described for Example 26.

The results of this study are shown in Table 29.2.

TABLE 29.2 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 14.1 Formulation Relative to OxyContin ® 10 mg in the Fasted State (Population: Full Analysis) Test/ 90% LS Mean^(a) Refer- Confidence Metric N (Test)^(b) N (Reference)^(b) ence^(c) Interval^(d) C_(max) (ng/mL) 81 9.36 81 9.15 102 (99.35, 105.42) AUC_(t) (ng*hr/ 81 107 81 109 98.3 (95.20, 101.48) mL) AUC_(inf) (ng*hr/ 81 108 81 110 98.0 (94.94, 101.19) mL) ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means. ^(b)Test = Example 14.1 tablet; Reference = OxyContin ® 10 mg tablet. ^(c)Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale. ^(d)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

The results show that Example 14.1 tablets are bioequivalent to OxyContin® 10 mg tablets in the fasted state.

Example 30

In Example 30, a randomized, open-label, single-center, single-dose, two-treatment, two-period, two-way crossover study in healthy human subjects was conducted to assess the bioequivalence of Example 14.5 oxycodone HCl (40 mg) formulation relative to the commercial OxyContin® formulation (40 mg) in the fed state.

The study treatments were as follows:

Test treatment: 1× Example 14.5 tablet (40 mg oxycodone HCl) Reference treatment: 1× OxyContin® 40 mg tablet

The treatments were each administered orally with 8 oz. (240 mL) water as a single dose in the fed state.

As this study was conducted in healthy human subjects, the opioid antagonist naltrexone hydrochloride was administered to minimize opioid-related adverse events.

Subject Selection

Screening procedures were performed as described for Example 26.

Subjects who met the inclusion criteria as described for Example 26 were included in the study. Potential subjects were excluded from the study according to the exclusion criteria as described for Example 26, except that item 11 of the exclusion criteria for this study refers to “refusal to abstain from food for 4 hours following administration of the study drugs and to abstain from caffeine or xanthine entirely during each confinement.”

Subjects meeting all the inclusion criteria and none of the exclusion criteria were randomized into the study. It was anticipated that approximately 84 subjects would be randomized, with approximately 76 subjects targeted to complete the study.

Check-in Procedures

The check-in procedures performed on day −1 of period 1 and at check-in for each period were performed as described in Example 26. Pre-dose (Day −1, Period 1 only) laboratory samples (hematology, biochemistry, and urinalysis) were collected after vital signs and SPO₂ had been measured following fasting for a minimum of 4 hours.

Prior to the first dose in Period 1, subjects were randomized to a treatment sequence according to the random allocation schedule (RAS) as described for Example 26. The treatment sequences for this study are presented in Table 30.1.

TABLE 30.1 Period 1 Period 2 Sequence Treatment 1 1x OxyContin ® 40 mg 1x Example 14.5 2 1x Example 14.5 1x OxyContin ® 40 mg

Study Procedures

The study included two study periods, each with a single dose administration. There was a washout period of at least six days between dose administrations in each study period. During each period, subjects were confined to the study site from the day prior to administration of the study drugs through 48 hours following administration of the study drugs, and subjects returned to the study site for 72-hour procedures.

At each study period, following a 10 hour overnight fast, the subjects were fed a standard meal (FDA high-fat breakfast) 30 minutes prior to administration of either Example 14.5 formulation or OxyContin® 40 mg tablets with 240 mL of water. No food was allowed for at least 4 hours post-dose.

Subjects received naltrexone HCl 50 mg tablets at −12, 0, 12, 24, and 36 hours relative to Example 14.5 formulation or OxyContin® dosing.

Subjects were standing or in an upright sitting position while receiving their dose of Example 14.5 formulation or OxyContin®. Subjects remained in an upright position for a minimum of 4 hours.

Fasting was not required for non-dosing study days.

During the study, adverse events and concomitant medications were recorded, and vital signs (including blood pressure, body temperature, pulse rate, and respiration rate) and SPO₂ were monitored.

Blood samples for determining oxycodone plasma concentrations were obtained for each subject at predose and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 8, 10, 12, 16, 24, 28, 32, 36, 48, and 72 hours postdose for each period.

For each sample, 6 mL of venous blood were drawn via an indwelling catheter and/or direct venipuncture into tubes containing K₂EDTA anticoagulant. Plasma concentrations of oxycodone were quantified by a validated liquid chromatography tandem mass spectrometric method.

The study completion procedures were performed as described for Example 26.

The results of this study are shown in Table 30.2.

TABLE 30.2 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 14.5 Formulation Relative to OxyContin ® 40 mg in the Fed State (Population: Full Analysis) Test/ 90% LS Mean^(a) (Refer- Confidence Metric N (Test)^(b) N Reference^(b) ence)^(c) Interval^(d) C_(max) (ng/mL) 76 59.8 80 59.9 99.9 (95.40, 104.52) AUC_(t) (ng*hr/ 76 514 80 556 92.5 (90.01, 94.99) mL) AUC_(inf) (ng*hr/ 76 516 80 558 92.4 (90.00, 94.96) mL) ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means. ^(b)Test = Example 14.5 tablet; Reference = OxyContin ® 40 mg tablet. ^(c)Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale. ^(d)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

The results show that Example 14.5 tablets are bioequivalent to OxyContin® 40 mg tablets in the fed state.

Example 31

In Example 31, a randomized, open-label, single-center, single-dose, two-treatment, two-period, two-way crossover study in healthy human subjects was conducted to assess the bioequivalence of Example 14.5 oxycodone HCl (40 mg) formulation relative to the commercial OxyContin® formulation (40 mg) in the fasted state.

The study treatments were as follows:

Test treatment: 1× Example 14.5 tablet (40 mg oxycodone HCl) Reference treatment: 1× OxyContin® 40 mg tablet

The treatments were each administered orally with 8 oz. (240 mL) water as a single dose in the fasted state.

As this study was conducted in healthy human subjects, the opioid antagonist naltrexone hydrochloride was administered to minimize opioid-related adverse events.

Subject Selection

Screening procedures were performed as described for Example 26.

Subjects who met the inclusion criteria as described for Example 26 were included in the study. Potential subjects were excluded from the study according to the exclusion criteria as described for Example 26.

Subjects meeting all the inclusion criteria and none of the exclusion criteria were randomized into the study. It was anticipated that approximately 84 subjects would be randomized, with approximately 76 subjects targeted to complete the study.

Check-in Procedures

The check-in procedures performed on day −1 of period 1 and at check-in for each period were performed as described in Example 26. Pre-dose (Day −1, Period 1 only) laboratory samples (hematology, biochemistry, and urinalysis) were collected after vital signs and SPO₂ had been measured following fasting for a minimum of 4 hours.

Prior to the first dose in Period 1, subjects were randomized to a treatment sequence according to the random allocation schedule (RAS) as described for Example 26. The treatment sequences for this study are presented in Table 31.1.

TABLE 31.1 Period 1 Period 2 Sequence Treatment 1 1x OxyContin ® 40 mg 1x Example 14.5 2 1x Example 14.5 1x OxyContin ® 40 mg

Study Procedures

The study included two study periods, each with a single dose administration. There was a washout period of at least six days between dose administrations in each study period. During each period, subjects were confined to the study site from the day prior to administration of the study drugs through 48 hours following administration of the study drugs, and subjects returned to the study site for 72-hour procedures.

At each study period, the subjects were administered the Example 14.5 formulation or OxyContin® 40 mg tablets with 240 mL of water, following a 10 hour overnight fast. Subjects continued fasting from food for at least 4 hours post-dose.

Subjects received naltrexone HCl 50 mg tablets at −12, 0, 12, 24, and 36 hours relative to Example 14.5 formulation or OxyContin® dosing.

Subjects were standing or in an upright sitting position while receiving their dose of Example 14.5 formulation or OxyContin®. Subjects remained in an upright position for a minimum of 4 hours.

Fasting was not required for non-dosing study days.

During the study, adverse events and concomitant medications were recorded, and vital signs (including blood pressure, body temperature, pulse rate, and respiration rate) and SPO₂ were monitored.

Blood samples for determining oxycodone plasma concentrations were obtained for each subject at predose and at 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 6, 8, 10, 12, 16, 24, 28, 32, 36, 48, and 72 hours postdose for each period.

For each sample, 6 mL of venous blood were drawn via an indwelling catheter and/or direct venipuncture into tubes containing K₂EDTA anticoagulant. Plasma concentrations of oxycodone were quantified by a validated liquid chromatography tandem mass spectrometric method.

The study completion procedures were performed as described for Example 26.

The results of this study are shown in Table 31.2.

TABLE 31.2 Statistical Results of Oxycodone Pharmacokinetic Metrics: Bioavailability Example 14.5 Formulation Relative to OxyContin ® 40 mg in the Fasted State (Population: Full Analysis) Test/ 90% LS Mean^(a) Refer- Confidence Metric N (Test)^(b) N (Reference)^(b) ence^(c) Interval^(d) C_(max) (ng/mL) 85 46.1 83 47.7 96.6 (92.80, 100.56) AUC_(t) (ng*hr/ 85 442 83 463 95.5 (92.93, 98.18) mL) AUC_(inf) (ng*hr/ 85 444 82 468 94.8 (92.42, 97.24) mL) ^(a)Least squares mean from ANOVA. Natural log (ln) metric means calculated by transforming the ln means back to the linear scale, i.e., geometric means. ^(b)Test = Example 14.5 tablet; Reference = OxyContin ® 40 mg tablet. ^(c)Ratio of metric means for ln-transformed metric (expressed as a percent). Ln-transformed ratio transformed back to linear scale. ^(d)90% confidence interval for ratio of metric means (expressed as a percent). Ln-transformed confidence limits transformed back to linear scale.

The results show that Example 14.5 tablets are bioequivalent to OxyContin® 40 mg tablets in the fasted state.

The present invention is not to be limited in scope by the specific embodiments disclosed in the examples which are intended as illustrations of a few aspects of the invention and any embodiments that are functionally equivalent are within the scope of this invention. Indeed, various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the art and are intended to fall within the scope of the appended claims.

A number of references have been cited, the entire disclosures of which are incorporated herein by reference for all purposes. 

1-169. (canceled)
 170. A method of treating pain comprising administering to a patient in need thereof a convection cured, shaped, extended release tablet comprising: (1) at least one high molecular weight polyethylene oxide having, based on rheological measurements, an approximate molecular weight selected from 4,000,000 and 7,000,000; and (2) oxycodone or a pharmaceutically acceptable salt thereof; wherein said tablet is prepared by a process comprising the steps of: (a) forming a tablet-shaped pharmaceutical preparation comprising said oxycodone or pharmaceutically acceptable salt thereof and said high molecular weight polyethylene oxide; (b) convection curing said tablet-shaped pharmaceutical preparation by subjecting said preparation to a temperature from about 60° C. to about 90° C. for a time of from about 15 minutes to about 10 hours; and (c) optionally applying at least one coating to said tablet-shaped pharmaceutical preparation, before, during or after curing; wherein said tablet comprises: (i) 5, 7.5, 10, 15, 20, or 30 mg of said oxycodone or pharmaceutically acceptable salt thereof, and at least 79% by weight of said high molecular weight polyethylene oxide; (ii) 40 mg of said oxycodone or pharmaceutically acceptable salt thereof and at least 72% by weight of said high molecular weight polyethylene oxide; (iii) 60 mg of said oxycodone or pharmaceutically acceptable salt thereof and at least 57% by weight of said high molecular weight polyethylene oxide; or (iv) 80 mg of said oxycodone or pharmaceutically acceptable salt thereof and at least 54% by weight of said high molecular weight polyethylene oxide; and wherein percent by weight is based upon the total weight of said tablet-shaped pharmaceutical preparation, not including the combined weight of said applied coatings.
 171. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said oxycodone or pharmaceutically acceptable salt thereof is oxycodone hydrochloride.
 172. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said time in said curing step is 30 minutes to 90 minutes.
 173. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said temperature in said curing step is from 62° C. to 90° C.
 174. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said tablet-shaped pharmaceutical preparation is coated before or after said curing step.
 175. A method of treating pain comprising administering to a patient in need thereof a convection cured, shaped, extended release tablet comprising: (1) at least one high molecular weight polyethylene oxide having, based on rheological measurements, an approximate molecular weight selected from 4,000,000 and 7,000,000; and (2) an opioid analgesic or a pharmaceutically acceptable salt thereof; wherein said tablet is prepared by a process comprising the steps of: (a) forming a tablet-shaped pharmaceutical preparation comprising said opioid or pharmaceutically acceptable salt thereof and said high molecular weight polyethylene oxide; (b) convection curing said tablet-shaped pharmaceutical preparation by subjecting said preparation to a temperature from about 60° C. to about 90° C. for a time of from about 15 minutes to about 10 hours; and (c) optionally applying at least one coating to said tablet-shaped pharmaceutical preparation, before, during or after curing; wherein said high molecular weight polyethylene oxide is in an amount of at least 54% by weight, based upon the total weight of said tablet-shaped pharmaceutical preparation, not including the combined weight of said applied coatings.
 176. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said temperature in said curing step is from 62° C. to 90° C.
 177. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein at least one coating is applied to said tablet-shaped pharmaceutical preparation, before, during or after said curing step.
 178. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt thereof is selected form the group consisting of oxycodone, hydrocodone, hydromorphone, oxymorphone, morphine, or pharmaceutically acceptable salts of any of the foregoing.
 179. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt thereof comprises oxycodone hydrochloride.
 180. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt thereof comprises hydrocodone or a pharmaceutically acceptable salt thereof.
 181. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt thereof comprises hydromorphone or a pharmaceutically acceptable salt thereof.
 182. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 181, wherein said hydromorphone or pharmaceutically acceptable salt thereof comprises hydromorphone hydrochloride.
 183. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt thereof comprises oxymorphone or a pharmaceutically acceptable salt thereof.
 184. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 183, wherein said oxymorphone or pharmaceutically acceptable salt thereof comprises oxymorphone hydrochloride.
 185. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said opioid analgesic or pharmaceutically acceptable salt comprises morphine or a pharmaceutically acceptable salt thereof.
 186. A method of treating pain comprising administering to a patient in need thereof a convection cured, shaped, extended release tablet comprising: (1) at least one high molecular weight polyethylene oxide having, based on rheological measurements, an approximate molecular weight selected from 4,000,000 and 7,000,000; and (2) oxycodone hydrochloride; wherein said tablet is prepared by a process comprising the steps of: (a) forming a tablet-shaped pharmaceutical preparation comprising said oxycodone hydrochloride and said high molecular weight polyethylene oxide; (b) convection curing said tablet-shaped pharmaceutical preparation by subjecting said preparation to a temperature from about 62° C. to about 90° C. for a time of from about 15 minutes to about 10 hours; and (c) optionally applying at least one coating to said tablet-shaped pharmaceutical preparation, before, during or after curing; wherein said tablet comprises: (i) 5, 7.5, 10, 15, 20, or 30 mg of said oxycodone hydrochloride, and at least 79% by weight of said high molecular weight polyethylene oxide; (ii) 40 mg of said oxycodone hydrochloride, and at least 72% by weight of said high molecular weight polyethylene oxide; (iii) 60 mg of said oxycodone hydrochloride, and at least 57% by weight of said high molecular weight polyethylene oxide; or (iv) 80 mg of said oxycodone hydrochloride, and at least 54% by weight of said high molecular weight polyethylene oxide; and wherein percent by weight is based upon the total weight of said tablet-shaped pharmaceutical preparation, not including the combined weight of said applied coatings.
 187. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said time in said curing step is 30 minutes to 90 minutes.
 188. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 187, wherein said tablet is coated before or after said curing step.
 189. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said tablet comprises 5, 7.5, 10, 15, 20, or 30 mg of said oxycodone or pharmaceutically acceptable salt thereof; and the percent by weight of said high molecular weight polyethylene oxide is at least 79%.
 190. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said tablet comprises 40 mg of said oxycodone or pharmaceutically acceptable salt thereof; and the percent by weight of said high molecular weight polyethylene oxide is at least 72%.
 191. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said tablet comprises 60 mg of said oxycodone or pharmaceutically acceptable salt thereof; and the percent by weight of said high molecular weight polyethylene oxide is at least 57%.
 192. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 170, wherein said tablet comprises 80 mg of said oxycodone or pharmaceutically acceptable salt thereof; and the percent by weight of said high molecular weight polyethylene oxide is at least 54%.
 193. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said tablet comprises 5, 7.5, 10, 15, 20, or 30 mg of said oxycodone or pharmaceutically acceptable salt thereof; said high molecular weight polyethylene oxide has an approximate molecular weight of 4,000,000; and the percent by weight of said high molecular weight polyethylene oxide is at least 79%.
 194. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said tablet comprises 40 mg of said oxycodone or pharmaceutically acceptable salt thereof; said high molecular weight polyethylene oxide has an approximate molecular weight of 4,000,000; and the percent by weight of said high molecular weight polyethylene oxide is at least 72%.
 195. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said tablet comprises 60 mg of said oxycodone or pharmaceutically acceptable salt thereof; said high molecular weight polyethylene oxide has an approximate molecular weight of 4,000,000; and the percent by weight of said high molecular weight polyethylene oxide is at least 57%.
 196. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said tablet comprises 80 mg of said oxycodone or pharmaceutically acceptable salt; said high molecular weight polyethylene oxide has an approximate molecular weight of 4,000,000; and the percent by weight of said high molecular weight polyethylene oxide is at least 54%.
 197. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 175, wherein said cured tablet-shaped pharmaceutical preparation has a density that is at least about 1% lower than the density of said preparation prior to curing.
 198. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said cured tablet-shaped pharmaceutical preparation has a density that is at least about 1% lower than the density of said preparation prior to curing.
 199. A method of treating pain comprising administering to a patient in need thereof a tablet as defined in claim 186, wherein said cured tablet-shaped pharmaceutical preparation has a density that is at least about 2% lower than the density of said preparation prior to curing. 